@ISDATE — returns 1 if its argument is a valid date within the supported range; returns 0 if the argument is missing, not a valid date, or outside of the supported range. The date may be in any input date format supported by this plugin.

Syntax:
%@ISDATE[date,infmt]

datethe date to examine
infmtthe input date format, used to interpret ambiguous dates

The date argument is not optional. Unlike many of the functions in this plugin, @ISDATE will not assume today’s date if you omit it.

• New: This function does not exist in Take Command.