Hi all, ODF 1.4 will introduce the EASTERSUNDAY function, 6.10.8 part4. The description has currently the constraints 1582 Year 9956 I would like to make it 1583 Year 9956. Reasoning: The calendar reform in 1582 had dropped the days 5. Oct. 1582 to 14. Oct. 1582. That means that a continues use of the Gregorian calendar is only possible after that days, but Eastern is before that days. We can avoid discussions whether the result of EASTERSUNDAY(1582) is a date in a "proleptic Gregorian" calendar or a "Julian" calendar by simply excluding 1582. LibreOffice returns an error for EASTERSUNDAY(1582). Kind regards, Regina