# Date and time tests

Discover the different date and time tests available in CQL.

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Use the summary below to quickly jump to a specific topic:

- [Before test](/reference/cql/expressions/tests/date-time/before): Learn how to check if a date time is before another.
- [After test](/reference/cql/expressions/tests/date-time/after): Learn how to check if a date time is after another.
- [At-time test](/reference/cql/expressions/tests/date-time/at-time): Learn how to check if a date time is at a specific time of day.