cmake CTEST_NIGHTLY_START_TIME examples

RavEngine/RavEngine deps/OpenXR-SDK/src/external/jsoncpp/CTestConfig.cmake :10 

set(CTEST_NIGHTLY_START_TIME "01:23:45 UTC")

LLNL/zfp CTestConfig.cmake :8 

set(CTEST_NIGHTLY_START_TIME "01:00:00 UTC")