Cycle year of 4713 BC
Julian calendar: The default date is January 1, 4713 BC. All dates use the proleptic Julian calendar, with years written as 4713 BC or AD 532. The BC/AD Julian calendar has no year 0. The year immediately before the year AD 1 is the year 1 BC. The selectors and their arrows change the era, year, month, day, and weekday.
Year buttons: The 4713 BC, 1 BC, and AD 532 buttons change the selected Julian year while preserving the month and day.
Cycle numbering: Both the 7980-year cycle and the 532-year cycle begin with 4713 BC as cycle year 1. Each cycle year runs from January 1 through December 31. The 7980-year cycle restarts at year 1 in AD 3268, and the 532-year cycle restarts at year 1 in 4181 BC. Numbering repeats in both directions, including before 4713 BC. Each box shows the selected year's position in its cycle and the corresponding Julian calendar year.
Cycle navigation: The arrows beside 7980 and 532 move the selected date backward or forward by that many Julian years, preserving its month, day, and weekday. A 7980-year jump preserves both cycle positions; a 532-year jump preserves the position within the 532-year cycle.