Not really used in China anymore, but to keep the party going - ie. being able to celebrate New Year's Eve twice a year, the calendar is still present around the world.
Like in the Hebrew Calendar:
- An ordinary year has 12 months, a leap year has 13 months.
- An ordinary year has 353, 354, or 355 days, a leap year has 383, 384, or 385 days.
Numbering years are done numbering 60 year cycles. The cycles come from counting years in two cycles:
The 60 year cycles are counted, and currently it's running on its 78th cycle.