|1||First date is on or before the second.|
|0|| First date is after the second.|
|FirstDate||String in date format.|
|SecondDate||String in date format.|
This command is like less than or equal to (<=).
Note this command is effectively
![DateIsAfter $FirstDate $SecondDate]
but still we include it for the sake of convenience / expressiveness.
For information about how to configure the format, see About Date and Time Commands.
For information regarding exceptions / errors, see here
% DateIsOnOrBefore 2000-01-01 2000-01-01
% DateIsOnOrBefore 2000-01-01 2000-01-02