Create a predicate for testing whether the first argument is less than or equal to the second.
@param x expression
@param y expression
@return less-than-or-equal predicate
Relational operator (lower than or equals)
@param expr the right-hand operand
@return true if the value of the left-hand operand is less than or equal to the value of the right-hand operand, and otherwise is false.
Compares if this Date is less than or equal to a given Date
@param date is the date to be compared against this Date
@return f this Date is less than or equal to a given Date
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