In general, the POSIX module provides access to system's implementation (whereas the builtin functions provide portability).

Isn't POSIX supposed to give platform-independent results?

If your platform doesn't conform to POSIX, that's an issue to take up with you platform's provider.

In reply to Re: Platform-dependent behavior observed in POSIX::strftime by ikegami
in thread [Explained] Platform-dependent behavior observed in POSIX::strftime by Narveson

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