What Date conventions does FO and GEDCOM understand?
GEDCOM understands dates in the form they are generated by FO. It is possible to modify dates to indicate date ranges and date uncertainty. FO will let you add any text to a date field but will not interpret some of it as a date and gedcom will accept but not understand some of it as well. You can also just leave out the part of the date that is unknown to indicate uncertainty. FO understands other abbreviations for some of these modifiers as well as the full spelling of the word and will translate them to the modifiers understood by GEDCOM. Some programs do not like entries in the GEDCOM file date fields that are not actual dates as defined in the GEDCOM standard. Modifier FO GEDCOM Notes ABT Yes Yes About BEF Yes Yes Before AFT Yes Yes After BET Yes Yes A single date that is between the dates given which are separated with the keyword AND. FRM Yes Yes A period that begins on the date TO Yes Yes A period that ends on the date. FO does not understand this keyword except in a FRM statem
