Chet is the first month of the Sikh calendar. The first day of this month is celebrated as the Nanakshahi New Year Day. The 6th guru
of the Sikhs, Guru Hargobind
passed away on the 6th and the 7th guru, Guru Har Rai
was born on the first of the month of Chet. According to Gregorian calendar, it falls between mid-March and mid-April.
[Source all india (80) 18-Apr-05]