Arvelie is an alphabetic date format.

The Arvelie calendar has 26 months of 14 days each.

Each month has 2 weeks of 7 days, and each month's name is one of the 26 letters of the alphabet. The 365th day of the year is the Year Day(+01), preceded by the Leap Day(+02) on leap years.

To calculate the day of the year, convert the month's letter to a value, starting with 0 for A, multiply by 14 and add the day of the month. For example, J05 is equal to (+ 5 (* 9 14)), or 131.

incoming(3): tracker calendar mountaen