The julian calendar is in use since 46 B.C. In 1582 it got replaced by the gregorian calender, which is still valid. The reason for the change was the fact that in the julian the year was 11 minutes and 14 seconds too long.
The Jewish or Hebrew calendar is a lunisolar calendar. It was revealed in the year 359.
Thai solar calendar (+543 years):
Prickle-Prickle, 52. The Aftermath, YOLD 3182
Trewsday, 21 Foreyule