Earlier quoted context omitted.
And in that calender, February is the last month, which makes it the logical month for adjusting leap years.
It looks like there's a legend that this was the case, but January has been the first month of the year through all of recorded history, and Julius Caesar's version was no different. EDIT: Because there's a lot of confusion in several replies I thought I'd clarify: February was the second month in Julius Caesar's calendar. Romans in the Republic describe the month as being at some point the last month in the calendar…
https://en.wikipedia.org/wiki/Jalali_calendar
The Iranian calendar (also known as Persian calendar or the Jalaali Calendar)
is a solar calendar currently used in Iran and Afghanistan. It is
observation-based, rather than rule-based, beginning each year on the vernal
equinox as precisely determined by astronomical observations from Tehran.
There are 12 months. The first 6 have 31 days and the rest have 30 days, except the last month which is 29 days. Every 4 years, it's a leap year and the last month becomes also 30 days.It's also precisely set to follow seasons. For example, the first day of Fall is actually the first day of "Mehr" (the 7th month). For some reason, the Gregorian calendar has it on Sep. 22.