CTEST_NIGHTLY_START_TIME

From Get docs
Cmake/docs/3.21/variable/ctest nightly start time


CTEST_NIGHTLY_START_TIME

New in version 3.1.


Specify the CTest NightlyStartTime setting in a ctest(1) dashboard client script.

Note that this variable must always be set for a nightly build in a dashboard script. It is needed so that nightly builds can be properly grouped together in CDash.

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https://cmake.org/cmake/help/v3.21/variable/CTEST_NIGHTLY_START_TIME.html