Date specifications

We can enter dates in various formats. The button left from the date fields selects the precision of the date, the button to the right the calendar.
The month can be entered as number as well.

The following applies:

'MAY 1890' is more precise than 'ABT 12 May 1890'. This is because limits have not been assigned to the precision of the prefixes such as ABT or EST.

'Period from/to' indicates the beginning and/or the ending of a happening or state.

'Range between/and' (BEFore …, AFTer …; BETween … AND …) indicates that the event happened at a point in time after or before the given date or at some time between date 1 AND date 2.
For example, BET 1904 AND 1915 indicates that the event state (perhaps a single day) existed somewhere between 1904 and 1915 inclusive.
The date range differs from the date period in that the date range is an estimate that an event happened on a single date somewhere in the date range specified.

The following entries are equivalent:

1852 – BET 1 JAN 1852 AND 31 DEC 1852
1852 – BET JAN 1852 AND 31 DEC 1852
JAN 1920 – BET 1 JAN 1920 AND 31 JAN 1920

About (ABT) = meaning the date is not exact.
Calculated (CAL) = mathematically, for example, from an event date and age.
Estimated (EST) = based on an algorithm using some other event date.
Interpreted (INT) = from the associated date phrase (in the field below).

A day and month or a day and year are no valid dates. Such information must be saved in a note.

Conflicting event dates should be represented by placing them in separate event structures with appropriate source citations rather than by placing them under the same enclosing event. For problems see GEDCOM Usage Recommendations.

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