Fix C++23 getDateTime() #142

Job	Run time
linux_clang (ubuntu-latest, Debug)	3m 31s
linux_gcc (ubuntu-latest, Debug)	4m 46s
linux_gcc_valgrind	1m 16s
linux_clang (ubuntu-latest, Release)	1m 26s
linux_gcc_sanitizers	2m 24s
linux_gcc (ubuntu-latest, Release)	2m 36s
windows_mingw64 (windows-latest, Debug)	5m 22s
macos_clang (macos-latest, Debug)	2m 43s
windows_mingw64 (windows-latest, Release)	2m 52s
windows_msvc2022	2m 1s
macos_clang (macos-latest, Release)	2m 34s
	31m 31s

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