The system provides the following functions for use in formulas.
now() : Returns the current date. This can be used in arithmetic formulas with other date values to give time periods.
defined(a) : Returns TRUE if the argument is defined and false otherwise.
max(a, b, c, ...) : Returns the maximum of its arguments. All the arguments should be of the same type.
min(a, b, c, ...) : Returns the minimum of its arguments. All the arguments should be of the same type.
if(COND, VAL1, VAL2) : If COND is not a logical (or boolean) value, the result is undefined. If COND is a logical value that evaluates to TRUE, VAL1 is returned, otherwise VAL2 is returned.
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