The following date fields occur at least once, on each of the tabs of the Date Entry Assistant Dialog:
|Calendar||4 calendars are supported. The current calendar of the Western world is Gregorian. You are recommended to use this wherever possible.|
|Day||Leave blank if not known|
|Month||Different calendars have different months (except that Gregorian and Julian share the same months). Leave this blank if the month is not known.|
|Year||If entering a simple date, you must specify a year. If you do not know the year, you should enter the date information you have as a Date Phrase. Years must always be entered as 4 digit values. The year 98, for example, will be interpreted as 0098.|
With the Gregorian calendar only you can optionally specify a year modifier - a 2-digit value in the second year field, following the ‘/’ character. Where a date is shown in this format (e.g. 1639/40), the year after the slash indicates the year as we think of it now (1640 in this case), and the year before the slash is the year as it would have been recorded at the time (1639 in this case). This way of writing dates is called double dating.
The year modifier, if supplied, should always be 2 digits, and one greater than the 2 digits before the slash character, or 00 if the last 2 digits before the slash character are 99 (e.g. 15 April 1699/00). For English and American dates, year modifiers are only applicable to years prior to 1752, and even then are only used for dates between 1 January and 24 March. The date 23rd November 1712 in England, for example, is not ambiguous, and therefore should not have a year modifier, whereas 23rd January 1712 is ambiguous. Is it 23 Jan 1711/12 or 23 Jan 1712/13?
With Gregorian calendars only, you can also specify B.C. dates by ticking thebox.
See The Gregorian Calendar for a brief description of the Gregorian calendar, and the complexities involved in its introduction.
See How to Enter Dates for tips on entering dates.