Compare datetimes

Compares datetime values

Evaluation

This expression evaluates to a function of the form:

(a, b) -> long

The function is consistent with sort order semantics of the Sort step.

Processing

Arguments a and b are compared and one of the following values is returned:

• 0 if a and b represent the same instant in time
• -1 if a represents an instant earlier in time than b
• 1 if a represents an instant later in time than b

An error is thrown if either a or b is not a datetime and not nil

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