The Kalachuri era also called the Haihaya era was a Hindu system of year numbering started by the King Ishwarsena in which the year numbering started at some time from 248 to 250 CE.
[1][2] The German scholar F. Kielhorn suggested that the system began in September 248, the year that began with the month of Asvina.
[3][4] It was first used in Gujarat and Maharashtra (particularly Northern Maharashtra[5]), from where it spread to Madhya Pradesh and Uttar Pradesh where it was used until the 13th century CE.
[6] Some sources cite an Early Kalachuri era founded in Mahismati through its ruler Maharaja Subandhu who could be an ancestor to the Kalachuris.
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