A list of days is used to define recurrent fixed dates and to use only one line in the resource file for them, instead of using several lines in a resource file needed for defining these recurrent fixed dates separately.
A list of days is specified by a ‘,’ separator character; it must contain two elements minimum and may have any number of elements. A single element of the list may not be set to a zero value and be not concrete therefore. (This would not make any sense in this context.)
Assuming a fixed date shall always occur on the 1st and the 15th day in every month of the year 1996, e.g. ‘Tax returns’, one solution would be on the one hand a fixed date entry in the resource file for the 1st of the month and another entry for the 15th of the month, which would be a total of two entries in the resource file for such a fixed date.
On the other hand, this expense can be reduced to a total of only one entry in the resource file by using a list of days, which is likewise valid for the 1st and the 15th day in every month, that is
19960001,15 Tax returns
The use of lists of days in the date part is permitted as follows:
Some examples to this: