Syntaxen för vanligt datum är dd MMM yyyy, dvs. (dag) (månad förkortning av engelsk månad tre bokstäver) (årtal). Exempel 12 MAY 1789.
Nedan utdrag av sid. 45, 46 och 47 i gedcom specifikationen som kan läsas här
http://phpgedview.sourceforge.net/ged551-5.pdf;DATE_EXACT:= {Size=10:11}
<DAY> <MONTH> <YEAR_GREG>
DATE_APPROXIMATED:= {Size=4:35}
[
ABT <DATE> |
CAL <DATE> |
EST <DATE>
]
Where:
ABT = About, meaning the date is not exact.
CAL = Calculated mathematically, for example, from an event date and age.
EST = Estimated based on an algorithm using some other event date.
DATE_EXACT:= {Size=10:11}
<DAY> <MONTH> <YEAR_GREG>
DATE_PERIOD:= {Size=7:35}
[
FROM <DATE> |
TO <DATE> |
FROM <DATE> TO <DATE>
]
Where:
FROM = Indicates the beginning of a happening or state.
TO = Indicates the ending of a happening or state.
Examples:
FROM 1904 to 1915
= The state of some attribute existed from 1904 to 1915 inclusive.
FROM 1904
= The state of the attribute began in 1904 but the end date is unknown.
TO 1915
= The state ended in 1915 but the begin date is unknown.
47
DATE_PHRASE:= {Size=1:35}
<TEXT>
Any statement offered as a date when the year is not recognizable to a date parser, but which gives
information about when an event occurred.
DATE_RANGE:= {Size=8:35}
[
BEF <DATE> |
AFT <DATE> |
BET <DATE> AND <DATE>
]
Where:
AFT = Event happened after the given date.
BEF = Event happened before the given date.
BET = Event happened 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 are equivalent and interchangeable:
Short form Long Form
1852 BET 1 JAN 1852 AND 31 DEC 1852
1852 BET 1 JAN 1852 AND DEC 1852
1852 BET JAN 1852 AND 31 DEC 1852
1852 BET JAN 1852 AND DEC 1852
JAN 1920 BET 1 JAN 1920 AND 31 JAN 1920
DATE_VALUE:= {Size=1:35}
[
<DATE> |
<DATE_PERIOD> |
<DATE_RANGE>|
<DATE_APPROXIMATED> |
INT <DATE> (<DATE_PHRASE>) |
(<DATE_PHRASE>)
]
The DATE_VALUE represents the date of an activity, attribute, or event where:
INT = Interpreted from knowledge about the associated date phrase included in parentheses.
48
An acceptable alternative to the date phrase choice is to use one of the other choices such as
<DATE_APPROXIMATED> choice as the DATE line value and then include the date phrase value
as a NOTE value subordinate to the DATE line tag.
The date value can take on the date form of just a date, an approximated date, between a date and
another date, and from one date to another date. The preferred form of showing date imprecision, is
to show, for example, MAY 1890 rather than ABT 12 MAY 1890. This is because limits have not
been assigned to the precision of the prefixes such as ABT or EST.
