gh-110850: Use public PyTime functions #14

Job	Run time
i686-pc-windows-msvc/msvc (Debug)	16m 11s
i686-pc-windows-msvc/msvc (Release)	20m 24s
x86_64-pc-windows-msvc/msvc (Debug)	16m 41s
x86_64-pc-windows-msvc/msvc (Release)	19m 5s
x86_64-apple-darwin/clang (Debug)	4m 35s
x86_64-apple-darwin/clang (Release)	5m 43s
aarch64-apple-darwin/clang (Debug)	1m 53s
aarch64-apple-darwin/clang (Release)	1m 49s
x86_64-unknown-linux-gnu/gcc (Debug)	1m 56s
x86_64-unknown-linux-gnu/gcc (Release)	2m 10s
x86_64-unknown-linux-gnu/clang (Debug)	2m 10s
x86_64-unknown-linux-gnu/clang (Release)	2m 0s
aarch64-unknown-linux-gnu/gcc (Debug)	1m 24s
aarch64-unknown-linux-gnu/gcc (Release)	1m 27s
aarch64-unknown-linux-gnu/clang (Debug)	1m 41s
aarch64-unknown-linux-gnu/clang (Release)	1m 40s
	1h 40m 49s

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