The Malayalam Calendar, or the Kollam Era (Malayalam: കൊല്ലവർഷം, romanized: Kollavaṟṣaṁ), is a sidereal solar calendar used in Kerala. The origin of the calendar has been dated to 825 CE, commemorating the establishment of Kollam.^[1][2][3]

There are many theories regarding the origin of the era, but according to recent scholarship, it commemorated the foundation of Kollam by Maruwan Sapir Iso, who was the leader of Persian Christian Settlers and trading guilds like Anjuvannam following the liberation of the Kingdom of Venad from the Chola rule by or with the assistance of the Chera emperor at Kodungallur.^[4][5] The Quilon Syrian copper plates were grants and privileges given to the trading guilds involved in the establishment of Kollam by Sthanu Ravi Varma.^[6]

Kollam was the capital of Venadu and an important port town of the Chera Kingdom in that period. Kollam Aandu was adapted in the entire Chera Kingdom (the contemporary states of Tamil Nadu, Karnataka, and Kerala), the majority of which is now in Kerala. In Malayalam-speaking Kerala, it is now called the Malayalam Era or 'Kollavarsham’ (Kollam Thontri Aandu). The earliest available record mentioning the Kollam Era is a royal decree by Sri Vallavan Goda, the King of Venadu, dated to c. 973 CE (Kollam Era 149). In the inscription, the phrase "Kollam Thontri Aandu" is employed.^[7] Another era, referred to as "Kollam Aḻintha Aandu", counting from 1097 CE, was reckoned by the Cholas for some time. It is tentatively calculated that the Chola overlords captured the port of Kollam in 1097 CE.^[7]

The origin of the Kollam Era has been dated to 825 CE, when the great convention in Kollam was held at the behest of King Kulashekharan. Kollam was an important town in that period, and the Malayalam Era is called 'Kollavarsham'.

There are multiple conflicting accounts regarding the origins of the Malayalam calendar, some of which are mentioned below:

• According to legend, Kollam era is attributed to the legend of the hero Paraśurāma, an avatar (incarnation) of the god Vishnu. It is sometimes divided into cycles of 1,000 years reckoned from 1176 BCE. Thus, 825 CE would have been the first year of the era's third millennium.^[8]
• The news of the physical disappearance of Sri Adi Shankaracharya in 820 CE at Kedarnath reached Kerala only a few years later. It is believed that Kerala began the Malayalam era, also called the Kollam era, in 825 CE in his memory.^[9][10][11]
• According to Hermann Gundert, Kollavarsham started as part of erecting a new Shiva Temple in Kollam and because of the strictly local and religious background, the other regions did not follow this system at first. Once Kollam port emerged as an important trade center, however, the other countries also started to follow the new system of calendar. This theory backs the remarks of Ibn Battuta as well.^[12][13]
• It is also believed that the era started as part of erection of the Thirupalkadal Sreekrishnaswamy Temple, family temple of Venad located at Keezhperoor or Kil-perur. Keezhperoor is a place located near Kilimanoor, which is used as prefix along with name of Venad and Travancore monarchs and is believed to be the maternal home of Kulasekhara Alvar.

The days of the week in the Malayalam calendar are suffixed with Aazhcha (ആഴ്ച), meaning week.

Like the months above, there are twenty seven stars starting from Aswati (Ashvinī in Sanskrit) and ending in Revatī. The 365 days of the year are divided into groups of fourteen days called Ñattuvela (ഞാറ്റുവേല), each one bearing the name of a star.

• Vishu (1st Medam): Malayali New Year (traditional)
• Deepavali (Thulam): Festival of Lights
• Onam
• 1st Chingam: Malayali New Year (as per the Kollam Era calendar)

Vishu (വിഷു), celebrated on the first day of Medam, Onam (ഓണം), celebrated on the star Thiruvonam [t̪iruʋoːɳəm] on the first day of Chingam, and Deepavali (ദീപാവലി), celebrated on the first day of Thulam, are three of the major festivals. The first day of Chingam is celebrated as the Kerala New Year, replacing Vishu (വിഷു), which was considered the beginning of a year until 825 CE. Vishu is still celebrated as the traditional Malayali New Year, as it is astronomically significant, 'Medam' being the first among the 12 rashis (the zodiac signs corresponding to the 12 months of a solar year).^{[citation needed]}. Deepavali is traditionally celebrated during Thulam which is the months of October and November.

The Makaravilakku festival is celebrated in the Ayyappa Temple at Sabarimala on the first day of Makaram month. This marks the grand finale of the two-month period to the Sabarimala pilgrimage. The 1st of Makaram marks the winter Solstice (Uttarayanam) and the 1st of Karkaṭakam marks the summer solstice (Dakshinayanam) according to the Malayalam calendar (according to the astronomical calendar, the summer solstice is on 21 June, and the winter solstice on 21 December).^{[citation needed]}

Chaitram 1 (usually coinciding with 20 March) or Medam 1 (mostly coinciding with 14 April, for 2019 it was on 15 April), both in the proximity of the date of the vernal equinox (21 March), mark the beginning of the new year in many traditional Indian calendars such as the Indian national calendar and the Tamil calendar. When the Government of Kerala adopted Kolla Varsham as the regional calendar, the first of Chingam, the month of the festival of Onam, was accepted as the Malayalam New Year instead.^{[citation needed]}

Many events in Kerala are related to the dates in the Malayalam calendar.

The agricultural activities of Kerala are centred on the seasons. The southwest monsoon which starts around 1 June is known as Etavappathi, meaning mid of month Etavam. The northeast monsoon which starts during mid October is called thulavarsham (rain in the month of thulam). The two harvests of paddy are called Kannikkoythu and Makarakkoythu (harvests in the months kanni and makaram) respectively.^{[citation needed]}

• Bengali calendar
• Hindu calendar
• Manipuri calendar
• Tamil calendar
• Vākyapañcāṅga
• Great flood of 99, in Kerala in 1924 CE, or 1099 ME

Wikimedia Commons has media related to Malayalam calendar.

• Free Malayalam Calendar for Android and iPhone without download
• Malayalam calendar with panchangam
• Malayalam Panchang Calendars with Tithi, Nakshtra etc
• Open Source software libraries for Malayalam Calendar