Since other countries have used different calendars at various times, SSA does not assume the date on a record is according to the Gregorian calendar. SSA considers the date on which a document was issued or the event recorded to determine the calendar used and whether the date(s) must be converted.

SSA does not assume the month and day correspond to the Gregorian date if a date is shown by other than the Gregorian calendar.

SSA assumes the Gregorian calendar was used regardless of when other church and civil authorities in the country adopted this calendar.

SSA assumes the Gregorian calendar was used to record events in the Middle East after February 1924 (the Greek Orthodox Church in the Middle East adopted this calendar in 1924—1 year after the Greek Government's official adoption of it).