The structure of a date part -- which gives Gcal the information at which date a fixed date happens -- of a line in the resource file is
either: yyyy[mm[dd|wwwn]]
yyyy- (4 digits), is the year including the century (range 0000...9999). Leading zeroes are required in case given year is less than 1000 and other components of the date part are trailing the year.
mm- (2 digits or 3 characters), is the month (range 00...12 or 99, respectively Jan, Feb...). A given 99 for the month means the last month of the year (== December). Leading zeroes are required in case given month is less than 10 and other components of the date part are trailing the month.
dd- (2 digits), is the day (range 00...31 or 99). A given 99 for the day means the last day of the month. Leading zeroes are required in case given day is less than 10 and other components of the date part are trailing the day.
www- (2...3 characters), is a short weekday name (range Mon...Sun).
n- (1 digit), is the n'th weekday www of month (range 1...5 or 9).
- n == 1...5
n'th weekday www of month.- n == 9
Last weekday www of month.
or: yyyy*d|wn[www]
yyyy- (4 digits), is the year including the century (range 0000...9999). Leading zeroes are required in case given year is less than 1000 and other components of the date part are trailing the year.
*d- (2 characters), is the reference to an ordinary date.
*w- (2 characters), is the reference to a date of an ISO-8601:1988 week.
n- (1...3 digits), is the value in days or in weeks, the fixed date occurs. A given 99 in connection with a short weekday name means the last weekday www of the year. A given 999 in connection with `*d' means the last day of a year, i.e. the 31st December. If the computed date doesn't occur in the year, i.e. exceeds the year bounds, the fixed date message is suppressed.
www- (2...3 characters), is a short weekday name (range Mon...Sun).
or: yyyy@e|t|dvar[[+|-]n]
yyyy- (4 digits), is the year including the century (range 0000...9999). Leading zeroes are required in case given year is less than 1000 and other components of the date part are trailing the year.
@e- (2 characters), is the reference to the Easter Sunday's date.
@t- (2 characters), is the reference to today's date.
@dvar- (2 characters), is the reference to a date variable.
[+|-]n- (1...4 alphanumeric characters), is the optional displacement value in days, the fixed date occurs relative to the Easter Sunday's date or date variables date. A given -999 means the first day of a year, i.e. the 1st January. A given +999 or 999 means the last day of a year, i.e. the 31st December. If the computed date doesn't occur in the year, i.e. exceeds the year bounds, the fixed date message is suppressed.
or: yyyy@e|t|dvar[+|-]nwww
yyyy- (4 digits), is the year including the century (range 0000...9999). Leading zeroes are required in case given year is less than 1000 and other components of the date part are trailing the year.
@e- (2 characters), is the reference to the Easter Sunday's date.
@t- (2 characters), is the reference to today's date.
@dvar- (2 characters), is the reference to a date variable.
[+|-]nwww- (3...7 alphanumeric characters), is the optional displacement value in weekdays, the fixed date occurs relative to the Easter Sunday's date or date variables date. A given -99 means the first weekday www of the year. A given +99 or 99 means the last weekday www of the year. If the computed date doesn't occur in the year, i.e. exceeds the year bounds, the fixed date message is suppressed.
Please note:
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