Japanese calendar types have included a range of official and unofficial systems. At present, Japan uses the Gregorian calendar together with year designations stating the year of the reign of the current Emperor; the lunisolar Chinese calendar was introduced to Japan via Korea in the middle of the sixth century. After that, Japan calculated its calendar using various Chinese calendar procedures, from 1685, using Japanese variations of the Chinese procedures, but in 1873, as part of Japan's Meiji period modernization, a calendar based on the solar Gregorian calendar was introduced. In Japan today, the old Chinese calendar is ignored. Japan has had more than one system for designating years. Including: The Chinese sexagenary cycle was introduced early into Japan, it was used together with era names, as in the 1729 Ise calendar shown above, for "the 14th year of Kyōhō, tsuchi-no-to no tori", i.e. 己酉. Now, the cycle is used except around New Year; the era name system was introduced from China, has been in continuous use since AD 701.
Since the Taishō Emperor's ascension in 1912, each emperor's reign has begun a new era. Nengō are the official means of dating years in Japan, all government business is conducted using that system, it is in general use in private and personal business. The Japanese imperial year is based on the date of the legendary founding of Japan by Emperor Jimmu in 660 BC, it was first used in the official calendar in 1873. However, it never replaced era names, since World War II has been abandoned; the Western Common Era system has come into common use since the Meiji period. Now, most people know it, as well as era names; the official dating system known as nengō, has been in use since the late 7th century. Years are numbered within eras. Beginning with Meiji, each reign has been one era, but many earlier Emperors decreed a new era upon any major event; the nengō system remains in wide use on official documents and government forms. The imperial year system was used from 1872 to the Second World War. Imperial year 1 was the year when the legendary Emperor Jimmu founded Japan – 660 BC according to the Gregorian Calendar.
Usage of kōki dating can be a nationalist signal, pointing out that the history of Japan's imperial family is longer than that of Christianity, the basis of the Anno Domini system. Kōki 2600 was a special year; the 1940 Summer Olympics and Tokyo Expo were planned as anniversary events, but were canceled due to the Second Sino-Japanese War. The Japanese naval Zero Fighter was named after this year. After the Second World War, the United States occupied Japan, stopped the use of kōki by officials. Today, kōki is used, except in some judicial contexts; the 1898 law determining the placement of leap years is based on the kōki years, using a formula, equivalent to that of the Gregorian calendar: if the kōki year number is evenly divisible by four, it is a leap year, unless the number minus 660 is evenly divisible by 100 and not by 400. Thus, for example, the year Kōki 2560 is divisible by 4; the Japanese government has announced a new period of year on 2019 April Reiwa. The Heisei Period will end on 2019 April 30 and so the new period of year is expected to start on first of May 2019.
See "Seasonal days", below. The modern Japanese names for the months translate to "first month", "second month", so on; the corresponding number is combined with the suffix 月. The table below uses traditional numerals. In addition, every month has a traditional name, still used by some in fields such as poetry; the opening paragraph of a letter or the greeting in a speech might borrow one of these names to convey a sense of the season. Some, such as Yayoi and Satsuki, do double duty as given names; these month names appear from time to time on jidaigeki, contemporary television shows and movies set in the Edo period or earlier. The old Japanese calendar was an adjusted lunar calendar based on the Chinese calendar, the year—and with it the months—started anywhere from about 3 to 7 weeks than the modern year, so in historical contexts it is not accurate to equate the first month with January. Japan uses a seven-day week, aligned with the Western calendar; the seven-day week, with names for the days corresponding to the Latin system, was brought to Japan around AD 800 with the Buddhist calendar.
The system was used for astrological purposes and little else until 1876. The names of the days come from the five visible planets, which in turn are named after the five Chinese elements, from the moon and sun. On the origin of the names of the days of the week see East Asian Seven Luminaries. Sunday and Saturday are regarded as "Western style take-a-rest days". Since the late 19th century, Sunday has been regarded as a "full-time holiday", Saturday a half-time holiday; these holidays have no religious meaning. Many Japanese retailers
Vikram Samvat. It uses solar sidereal years; the Vikram Samvat is notable because many medieval era inscriptions use it. It is said to be named after the legendary king Vikramaditya, but the term "Vikrama Samvat" does not appear in the historical records before the 9th century, rather the same calendaring system is found by other names such as Krita and Malava. In the colonial era scholarship, the era was believed to be based on the commemoration of King Vikramaditya expelling the Sakas from Ujjain; however epigraphical evidence and scholarship suggest that this theory has no historical basis and likely was an error. Starting in the 9th century and thereafter, epigraphical artwork uses Vikrama-Samvat, suggesting that sometime around the 9th-century, the Hindu calendar era, in use became popular as Vikram Samvat, while Buddhist and Jain epigraphy continued to use an era based on the Buddha or the Mahavira. According to popular tradition, the legendary king Vikramaditya of Ujjain established the Vikrama Samvat era after defeating the Śakas.
Kalakacharya Kathanaka by the Jain sage Mahesarasuri gives the following account: Gandharvasena, the then-powerful king of Ujjain, abducted a nun called Sarasvati, the sister of the monk. The enraged monk sought the help of the Śaka ruler King Sahi in Sistan. Despite heavy odds but aided by miracles, the Śaka king defeated Gandharvasena and made him a captive. Sarasvati was repatriated; the defeated king retired to the forest. His son, being brought up in the forest, had to rule from Pratishthana. On, Vikramaditya invaded Ujjain and drove away from the Śakas. To commemorate this event, he started a new era called the "Vikrama era"; the Ujjain calendar started around 58–56 BCE, the subsequent Shaka era calendar was started in 78 CE at Pratishthana. The association of the era beginning in 57 BCE with Vikramaditya is not found in any source before the 9th century CE; the earlier sources call this era by various names, including Kṛṭa, the era of the Malava tribe, or Samvat. The earliest known inscription that calls the era "Vikrama" is from 842 CE.
This inscription of Chauhana ruler Chandamahasena was found at Dholpur, is dated Vikrama Samvat 898, Vaishakha Shukla 2, Chanda. The earliest known inscription that associates this era with a king called Vikramaditya is dated 971 CE; the earliest literary work that connects the era to Vikramaditya is Subhashita-Ratna-Sandoha by the Jain author Amitagati. For this reason, multiple authors believe that the Vikram Samvat was not started by Vikramaditya, who might be a purely legendary king or the title adopted by a king who renamed the era after himself. V. A. Smith and D. R. Bhandarkar believed that Chandragupta II adopted the title Vikramaditya, changed the name of the era to "Vikrama Samvat". According to Rudolf Hoernlé, the king responsible for this change was Yashodharman: Hoernlé believed that he conquered Kashmir, is the same person as the "Harsha Vikramaditya" mentioned in Kalhana's Rajatarangini. Earlier, some scholars believed that the Vikrama Samavat corresponded to the Azes era of the Indo-Scythian king King Azes.
However, this was disputed by Robert Bracey following the discovery of an inscription of Vijayamitra, dated in two eras. The theory seems to be now discredited by Falk and Bennett, who place the inception of the Azes era in 47–46 BCE; the traditional New Year of Vikram Samvat is one of the many festivals of Nepal, marked by parties, family gatherings, the exchange of good wishes, participation in rituals to ensure good fortune in the coming year. It occurs in mid-April each year, coincides with the traditional new year in Assam, Burma, Kerala, Manipur, Punjab, Sri Lanka, Tamil Nadu and Thailand. In addition to Nepal, the Vikram Samvat calendar is recognized in North and East India, in Gujarat among Hindus. Hindu religious festivals are based on a Luni-Solar calendar, not Solar calendar, based on Vikram Samvat. In North India, the new year in Vikram Samvat starts from the first day of Chaitra Skukla paksha. In Buddhist communities, the month of Baishakh is associated with Buddha's Birthday, it commemorates the birth and passing of Gautama Buddha on the first full moon day in May, except in a leap year when the festival is held in June.
Although this festival is not held on the same day as Pahela Baishakh, the holidays fall in the same month of the Bengali and Theravada Buddhist calendars, are related through the spread of Hinduism and Buddhism in the Indian subcontinent. In Gujarat, the day after Diwali is celebrated as the first day of the Vikram Samvat calendar, the first day of the month Kartik; the Vikrami era is an ancient calendar and has been used by Hindus and Sikhs. It is one of the several regional Hindu calendars that have been in use on the Indian subcontinent, it is based on twelve synodical lunar months and 365 solar days; the lunar new year starts on the new moon in the month of Chaitra. This day, known as Chaitra Sukhladi, is a restricted holiday in India; the Vikrami Samvat has been in use in the Indian subcontinent since ancient times, remains in use by the Hindus in north, w
The 9th century was a period from 801 to 900 in accordance with the Julian calendar in the Common Era. Around the 9th century the Edo people of what is now southeastern Nigeria developed bronze casts of humans and mythical creatures; these bronzes, which were used as vessels, amulets and sacrificial tools, are among the earliest made bronzes found in Nigeria. Most items were part of a burial of a nobleman culture in the northern part of benin empire. Evidence of long distance trade between benin empire and poutugist was discovered through the thousands of glass beads found at Old Cairo at the workshops of Fustat; the development of the Benin Kingdom can be attributed to the proficiency at advanced metallurgy seen in the bronze jewelry crafted by local artisans. The Ghana Empire was located in what is now western Mali, it is considered the first of the Sahelian Kingdoms, which would exist in some form until the early 20th century. Britain experienced a great influx of Viking peoples in the 9th century as the Viking Age continued from the previous century.
The kingdoms of the Heptarchy were conquered by the Danes, who set up Anglo-Saxon puppet rulers in each kingdom. This invasion was achieved by a huge military force known as the Great Heathen Army, led by Ivar the Boneless, Halfdan Ragnarsson, Guthrum; this Danish army first arrived in Britain in 865 in East Anglia. After conquering that kingdom, the army proceeded to capture the city of York and establish the kingdom of Jorvik; the Danes went on to subjugate the kingdom of Northumbria and to take all but the western portion of Mercia. The remaining kingdom of Wessex was the only kingdom of the Heptarchy left. Alfred the Great managed to maintain his kingdom of Wessex and push back the Viking incursions, relieving the neighbouring kingdoms from the threat of the Danes following his famous victory over them at the Battle of Ethandun in 878. Alfred re-established Anglo-Saxon rule over the western half of Mercia, the Danelaw was established which separated Mercia into halves, the eastern half remaining under the control of the Danes.
Ireland was affected by the Viking expansion across the North Sea. Extensive raids were carried out all along the coast and permanent settlements were established, such as that of Dublin in 841. Particular targets for these raids were the monasteries on the western coast of Ireland, as they provided a rich source for loot. On such raids the Vikings set up impermanent camps, which were called longphorts by the Irish—this period of Viking raids on the coasts of Ireland has been named the longphort phase after these types of settlements. Ireland in the 9th century was organised into an amalgam of small kingdoms, called tuatha; these kingdoms were sometimes ruled by a single, provincial ruler. If such a ruler could establish and maintain authority over a portion of these tuatha, he was sometimes granted the title of High King. Scotland experienced significant Viking incursions during the 9th century; the Vikings established themselves in coastal regions in northern Scotland, in the northern islands such as Orkney and Shetland.
The Viking invasion and settlement in Scotland provided a contributing factor in the collapse of the kingdoms of the Picts, who inhabited most of Scotland at the time. Not only were the Pictish realms either destroyed or weakened, the Viking invasion and settlement may have been the reason for the movement of Kenneth MacAlpin, the king of Dál Riata at that time; the kingdom of Dál Riata was located on the western coast of Scotland, Viking incursions destroyed it after the death of its previous king, Áed mac Boanta in 839, according to the Annals of Ulster. This may have caused the new king, MacAlpin, to move to the east, conquer the remnants of the Pictish realms. MacAlpin became king of the Picts in 843 and kings would be titled as the King of Alba or King of Scots. Art in the 9th century was dedicated to the Gospel and employed as basic tools of liturgy of the Roman Orthodox Church. Thousands of golden art objects were made: Sacred cups, reliquaries, rosaries, altar pieces, statues of the Virgin and Child or Saints all kept the flame of western art from dying out.
Architecture began to revive to some extent by the 9th century, taking the form of Church facilities of all kinds, the first castle fortifications since Roman times began to take form in simple "moat and bailey" castles, or simple "strong point" tower structures, with little refinement. 9th - 13th century - El Castillo, Chichen Itza, Mexico, is built. Itza culture. An unknown event causes the decline of the Maya Classical Era. Beowulf might have been written down in this century. Reign of Charlemagne, concurrent Carolingian Renaissance in Western Europe. Large-scale Viking attacks on Europe begin, devastating countless numbers of people. Oseberg ship burial; the Magyars begin their conquest of Pannonia, a process that will take several decades to be completed. The Tukolor settle in the Senegal river valley. Muslim traders settle in the southeast of Madagascar. 800: Charlemagne is crowned emperor of Rome by Pope Leo III. 800: Charlemagne expands the Frankish state and founds the Carolingian Empire.
He rules over the empire for 14 years. 800: An Arab fleet sails up the Tiber. 800 – 909: Rule of Aghlabids as an independent Muslim dynasty in North Africa, with their capital at Tunis. 802: Jayavarman II of the Khmer people in Cambodia founds the Khmer empire and establishes the Angkorian dynasty. 803: Construction on t
Indian national calendar
The Indian national calendar, sometimes called the Shalivahana Shaka calendar. It is used, alongside the Gregorian calendar, by The Gazette of India, in news broadcasts by All India Radio and in calendars and communications issued by the Government of India; the Saka calendar is used in Java and Bali among Indonesian Hindus. Nyepi, the "Day of Silence", is a celebration of the Saka new year in Bali. Nepal's Nepal Sambat evolved from the Saka calendar. Prior to colonization, the Philippines used to apply the Saka calendar as well as suggested by the Laguna Copperplate Inscription; the term may ambiguously refer to the Hindu calendar. The historic Shalivahana era calendar is still used, it has years. The calendar months follow the signs of the tropical zodiac rather than the sidereal zodiac used with the Hindu calendar. Chaitra has 30 days and starts on March 22, except in leap years, when it has 31 days and starts on March 21; the months in the first half of the year all have 31 days, to take into account the slower movement of the sun across the ecliptic at this time.
The names of the months are derived from older, Hindu lunisolar calendars, so variations in spelling exist, there is a possible source of confusion as to what calendar a date belongs to. Years are counted in the Saka era. To determine leap years, add 78 to the Saka year – if the result is a leap year in the Gregorian calendar the Saka year is a leap year as well, its structure is just like the Persian calendar. Senior Indian Astrophysicist Meghnad Saha was the head of the Calendar Reform Committee under the aegis of the Council of Scientific and Industrial Research. Other members of the Committee were: A. C. Banerjee, K. K. Daftari, J. S. Karandikar, Gorakh Prasad, R. V. Vaidya and N. C. Lahiri, it was Saha's effort. The task before the Committee was to prepare an accurate calendar based on scientific study, which could be adopted uniformly throughout India, it was a mammoth task. The Committee had to undertake a detailed study of different calendars prevalent in different parts of the country. There were thirty different calendars.
The task was further complicated by the fact that religion and local sentiments were integral to those calendars. India's first prime minister, Jawaharlal Nehru, in his preface to the Report of the Committee, published in 1955, wrote: “They represent past political divisions in the country.... Now that we have attained Independence, it is desirable that there should be a certain uniformity in the calendar for our civic and other purposes, this should be done on a scientific approach to this problem.” Usage started at 1 Chaitra 1879, Saka Era, or 22 March 1957. Report of the Calendar Reform Committee – online link. Mapping Time: The Calendar and its History by E. G. Richards, 1998, pp. 184–185. Calendars and their History Indian Calendars Positional astronomy in India Indian National Calendar abstract
The 8th century is the period from 701 to 800 in accordance with the Julian calendar in the Common Era. The coast of North Africa and the Iberian Peninsula come under Islamic Arab domination; the westward expansion of the Umayyad Empire was famously halted at the Siege of Constantinople by the Byzantine Empire and the Battle of Tours by the Franks. The tide of Arab conquest came to an end in the middle of the 8th century. In Europe, late in the century, the Vikings, seafaring peoples from Scandinavia, begin raiding the coasts of Europe and the Mediterranean, go on to found several important kingdoms. In Asia, the Pala Empire is founded in Bengal; the Tang dynasty reaches its pinnacle under Chinese Emperor Xuanzong. The Nara period begins in Japan. Estimated century in which the poem Beowulf is composed. Classical Maya civilization begins to decline; the first Serbian state is formed at the beginning of the century. Borobodur, the famous Indonesian Buddhist structure, begins construction as a non-Buddhist shrine.
Buddhist Jataka stories are translated into Arabic as Kalilag and Damnag. An account of Buddha's life is translated into Greek by Saint John of Damascus, circulated to Christians as the story of Barlaam and Josaphat. Height of the Classic period in pre-Columbian Maya civilization history. Śāntideva, a Buddhist monk at Nalanda Monastery in India, composes the famous Bodhicharyāvatāra, or Guide to the Bodhisattva's Way of Life. The height of the Giant Wild Goose Pagoda in Xian, China is extended by 5 stories. 701: The Taihō Code is enacted in late Asuka period Japan. 705: Overthrow of Empress Wu Zetian, the reign of China's first and only sole-ruling empress ends. 705: Justinian II is forced to give the title Caesar of Byzantium to the Bulgarian Emperor Tervel. The Byzantine Empire begins to pay annual tributes to Bulgaria. 708 – 711: The Bulgarians defeat Justinian II at the battle of Anchiallus. Arab armies occupied Sindh. 710: Empress Genmei moves the capital to Heijō-kyū, initiating the Nara period of Japan.
711: Palenque is conquered by Toniná. 711: Tariq ibn Ziyad crosses the Straits of Gibraltar. With the creation of Al-Andalus, most of the Iberian Peninsula is conquered by Arab and Berber Muslims, thus ending the Visigothic rule, beginning eight centuries of Muslim rule. 712: Liutprand, King of the Lombards begins his reign. C. 712: Metropolitan episcopal see is established by the Church of the East in Chinese capital of Chang'an. 712 – 756: Emperor Xuanzong reigned, the time was considered one of China's high points. 712 – 740: Caliphate campaigns in India 713: Death of Dajian Huineng and last Patriarch of Chán Buddhism. 717 – 718: Siege of Constantinople. The Bulgarians and the Byzantines decisively defeat the invading Arabs, thus halting the Arab advance toward Europe. 718: Sri Indravarman King of Srivijaya send a letter to the Caliph Umar bin Abdul Aziz of the Umayyad Caliphate in Damascus, signing early ancient Indonesian official contact with Islamic world in the Middle East. 726: Byzantine Emperor Leo III the Isaurian destroys the icon of Christ above the Chalke Gate in the capital city of Constantinople, beginning the first phase of the Byzantine Iconoclasm.
731: Bede completes his Historia ecclesiastica gentis Anglorum. 732: Battle of Tours. Near Poitiers, leader of the Franks Charles Martel and his men defeat a large army of Moors under the governor of Cordoba, Abdul Rahman Al Ghafiqi, killed during the battle; the Battle of Tours halts the advance of Islam into Western Europe and establishes a balance of power between Western Europe and the Byzantine Empire. 732: The Sanjaya dynasty is founded around this time according to the Canggal inscription. 738: Quiriguá declares independence from Copan 740: Battle of Akroinon. Byzantines win their first large-scale victory in a pitched battle against the Arabs. 742: For the municipal census of the Tang-dynasty Chinese capital city Chang'an and its metropolitan area of Jingzhou Fu, the New Book of Tang records that in this year there were 362,921 registered families with 1,960,188 persons. 748: The Chinese Buddhist monk Jian Zhen writes in his Yue Jue Shu of the international sea traffic coming to Guangzhou, ships from Borneo, Sri Lanka and others bringing tons of goods.
750: The last Umayyad Caliph Marwan II is overthrown and executed by the first Abbasid Caliph, Abu al-Abbas al-Saffah. The Caliphate is moved to Baghdad which would develop into a centre of trade and culture; the Ghana Empire begins in western Africa. Mid-8th century - Great Wild Goose Pagoda at Ci'en Temple, Xi'an, Shanxi, is rebuilt. C. mid-8th century - Camel Carrying a Group of Musicians, from a tomb near Xi'an, Shanxi, is made. Tang dynasty, it is now kept at Museum of Beijing. 751: Arabian armies defeat Chinese Tang dynasty troops in the Battle of Talas, in the high Pamirs near Samarkand, conquer Central Asia completely. 752: The Hindu Medang kingdom flourishes and declines. 755 – 763: The An Shi Rebellion devastates China during the mid Tang dynasty. 757: King Offa of Mercia becomes dominant ruler in England. 758: Arab and Persian pirates and travelers burn and loot the Chinese city of Guangzhou, while the Tang Dynasty authorities shut the port down for the next five decades. 760: The construction of Borobudur started.
768: Pepin dies. 770's – 780's: Java launched series of naval raids on ports of Dai Viet and Cambodia. The naval raids was launched by Sailendran-Srivijayan Maharaja
Tenpyō was a Japanese era name after Jinki and before Tenpyō-kanpō. This period spanned the years from August 729 through April 749; the reigning emperor was Shōmu-tennō. 729 Tenpyō gannen: The new era name was created to mark an event or series of events. The previous era ended and the new one commenced in Jinki 6, on the 5th day of the 8th month of 729. 740: In the court of Emperor Shōmu in Nara, Kibi no Makibi and Genbō conspire to discredit Fujiwara no Hirotsugu, Dazai shoni in Kyushu. 740: Hirotsugu revolts in reaction to the growing influence of Genbō and others. 740: Under the command of Ōno no Azumabito, an army of 17,000 is sent to Kyushu to stop the potential disturbance. 740: Hirotsugu is decisively beaten in battle. 740: The capital is moved to Kuni-kyō. 741: The Emperor calls for nationwide establishment of provincial temples. Provincial temples and provincial nunneries were established throughout the country; the more formal name for these "kokubunji" was "konkomyo-shitenno-gokoku no tera".
The more formal name for these "bokubunniji" was "hokke-metuzai no tera". 743: The Emperor issues a rescript to build the Daibutsu to be completed and placed in Tōdai-ji, Nara. 743: The law of Perpetual Ownership of Cultivated Lands issued 744: Naniwa-kyō announced as capital. 745: The capital returns to Heijō-kyō, construction of the Great Buddha resumes. 749: After a 25-year reign, Emperor Shōmu abdicates in favor of his daughter, Takano-hime, who will become Empress Kōken. After his abdication, Shomu took the tonsure, thus becoming the first retired emperor to become a Buddhist priest. Empress Kōmyō, following her husband's example took holy vows in becoming a Buddhist nun. Brown, Delmer M. and Ichirō Ishida, eds.. Gukanshō: The Future and the Past. Berkeley: University of California Press. ISBN 978-0-520-03460-0. Japan encyclopedia. Cambridge: Harvard University Press. ISBN 978-0-674-01753-5. Nihon Ōdai Ichiran. Paris: Royal Asiatic Society, Oriental Translation Fund of Great Britain and Ireland.
OCLC 5850691 Varley, H. Paul.. A Chronicle of Gods and Sovereigns: Jinnō Shōtōki of Kitabatake Chikafusa. New York: Columbia University Press. ISBN 9780231049405.
The Nanakshahi calendar is a tropical solar calendar, used in Sikhism and is based on the'Barah Maha'. Barah Maha was composed by the Sikh Gurus and translates as the "Twelve Months", it is a poem reflecting the changes in nature which are conveyed in the twelve-month cycle of the Year. The year begins with 1 Chet corresponding to 14 March; the first year of the Nanakshahi Calendar starts in 1469 CE: the year of the birth of Guru Nanak Dev. The Nanakshahi Calendar is named after the founder of Guru Nanak Dev. Sikhs have traditionally recognised luni-solar calendars: the Nanakshahi and Khalsa. Traditionally, both these calendars followed the Bikrami calendar with the Nanakshahi year beginning on Katak Pooranmashi and the Khalsa year commencing with Vaisakhi; the methods for calculating the beginning of the Khalsa era were based on the Bikrami calendar. The year length was the same as the Bikrami solar year. According to Steel, the calendar has twelve lunar months that are determined by the lunar phase, but thirteen months in leap years which occur every 2–3 years in the Bikrami calendar to sync the lunar calendar with its solar counterpart.
Kay abbreviates the Khalsa Era as KE. References to the Nanakshahi Era have been made in historic documents. Banda Singh Bahadur adopted the Nanakshahi calendar in 1710 C. E. after his victory in Sirhind according to which the year 1710 C. E. became Nanakshahi 241. However, Singh states the date of the victory as 14 May 1710 CE. According to Dilagira, Banda "continued adopting the months and the days of the months according to the Bikrami calendar". Banda Singh Bahadur minted new coins called Nanakshahi. Herrli states. Although Banda may have proclaimed this era, it cannot be traced in contemporary documents and does not seem to have been used for dating". According to The Panjab Past and Present, it is Gian Singh who "is the first to use Nanak Shahi Samvats along with those of Bikrami Samvats" in the Twarikh Guru Khalsa. According to Singha, Gian Singh was a Punjabi author born in 1822. Gian Singh wrote the Twarikh Guru Khalsa in 1891; the revised Nanakshahi calendar was designed by Pal Singh Purewal to replace the Bikrami calendar.
The epoch of this calendar is the birth of the first Sikh Guru, Nanak Dev in 1469 and the Nanakshahi year commences on 1 Chet. New Year's Day falls annually on; the start of each month is fixed. According to Kapel, the solar accuracy of the Nanakshahi calendar is linked to the Gregorian civil calendar; this is because the Nanaskhahi calendar uses the tropical year instead of using the sidereal year, used in the Bikrami calendar or the old Nanakshahi and Khalsa calendars. The amended Nanakshahi calendar was adopted in 1998 but implemented in 2003 by the Shiromani Gurdwara Prabhandak Committee to determine the dates for important Sikh events; the calendar was implemented during the SGPC presidency of Sikh scholar Prof. Kirpal Singh Badungar at Takhat Sri Damdama Sahib in the presence of Sikh leadership. Nanakshahi Calendar recognizes the adoption event, of 1999 CE, in the Sikh history when SGPC released the first calendar with permanently fixed dates in the Tropical Calendar. Therefore, the calculations of this calendar do not regress back from 1999 CE into the Bikrami era, fixes for all time in the future.
Features of the Original Nanakshahi calendar: Uses the accurate Tropical year rather than the Sidereal year Called Nanakshahi after Guru Nanak Year 1 is the Year of Guru Nanak's Birth. As an example, April 14, 2019 CE is Nanakshahi 551. Is Based on Gurbani – Month Names are taken from Guru Granth Sahib Contains 5 Months of 31 days followed by 7 Months of 30 days Leap year every 4 Years in which the last month has an extra day Approved by Akal Takht in 2003 In 2010, the Shiromani Gurdwara Prabhandak Committee modified the calendar so that the dates for the start of the months are movable so that they coincide with the Bikrami calendar and changed the dates for various Sikh festivals so they are based upon the lunar phase; this has created controversy with some bodies adopting the original 2003 version called the "Mool Nanakshahi Calendar" and others, the 2010 version. By 2014, the SGPC had scrapped the original Nanakshahi calendar from 2003 and reverted to the Bikrami calendar however it was still published under the name of Nanakshahi.
The Sikh bodies termed it a step taken under pressure from the Shiromani Akali Dal. There is some controversy about the acceptance of the calendar altogether among certain sectors of the Sikh world. SGPC president, Gobind Singh Longowal, on 13 March 2018 urged all Sikhs to follow the current Nanakshahi calendar; the previous SGPC President before Longowal, Prof. Kirpal Singh Badungar, tried to appeal the Akal Takht to celebrate the birthday of Guru Gobind Singh on 23 Poh as per the original Nanakshahi calendar, but the appeal was denied; the PSGPC and a majority of the other gurdwara managements across the world are opposing the modified version of the calendar citing that the SGPC reverted to the Bikrami calendar. They argue that in the Bikrami calendar, dates of many gurpurbs coincide, thereby creating confusion among the Sikh Panth. According to Ahaluwalia, the Nanakshahi calendar goes against the use of lunar Bikrami dates by the Gurus themselves and is contradictory, it begins with the year of birth of