The Maithil Calendar
The day is reckoned from sunrise to sunrise. Festivals, however, are performed according to Tithi.Tithi may start anytime during the day and may last for 20 to 26 hours. Day and night have 4 prahars each.
For month both lunar and solar systems are followed. Lunar months end on full-moon day. Solar months are reckoned with Sankranti. Sankranti match with dates of Gregorian Calendar.
There are several New Years: Starting on 1 Chaitra, Chaitra Amavasya (Vikram), Mesha sankranti (Shakabda), 1 Savan (Sal). By convention, the last one is prevalent in Mithilanchal i.e. Shravan to Ashadh.