Don't rely on *stream libray to polyfill strptime on Windows

[rongjiecomputer]

std::get_time will pull in the bulk of *stream library and increase the binary size of the final executable a lot.

I know this is a big ask for cctz team because strptime is very complicated to implement, but we have a requirement to not rely on *stream library for binary size concern.

[ngoclamhong38-crypto]

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