ForAnyValue:DateEqualsIfExists
compares a list of datetimes in a request to a list of datetimes in your policy. Datetime comparisons compare down to the second; so for DateEquals to match, the time must match exactly.
To match a request, the context key must exist in the request and at least one datetime in the request must match one of the datetimes in your policy.
You can NOT use policy variables in the value of this operator.

