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std.Io: Standardize the epoch as 1970-01-01T00:00:00Z - #25814
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Enforcing a standard epoch in the Io.Clock API allows usage to be simplified, as it allows users to not have to constantly deal with implementation-defined epochs. For example, this change fixesziglang#25776 because on Windows (which previously would return a value relative to a different epoch), the crypto.Certificate code would compare a Unix timestamp to the value returned by the `.real` clock. To fix this while keeping the implementation-defined epoch, every usage of Clock.real would have to be audited and deal with converting between epochs in a platform-specific way. Note also that Windows is the only odd-one out in the current implementation: - WASI uses the 1970-01-01T00:00:00Z epoch: https://github.com/WebAssembly/WASI/blob/9ea0e7534f46f0c39f28b386fa2becf00923a857/legacy/preview0/docs.md?plain=1#L30-L32 - POSIX uses the 1970-01-01T00:00:00Z epoch: https://pubs.opengroup.org/onlinepubs/9699919799/ and https://pubs.opengroup.org/onlinepubs/9799919799/basedefs/V1_chap03.html#tag_03_125
squeek502
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Nov 5, 2025
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Closing in favor of #25817 |
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This is only one way of addressing this. Considering this change was intentional, as before #25592,
time.nanoTimestampdid perform this conversion to a Unix timestamp on Windows, this may not be the intended fix.See #25776 (comment) for context (cc @castholm)
Enforcing a standard epoch in the Io.Clock API allows usage to be simplified, as it allows users to not have to constantly deal with implementation-defined epochs.
For example, this change fixes#25776 because on Windows (which previously would return a value relative to a different epoch), the crypto.Certificate code would compare a Unix timestamp to the value returned by the
.realclock. To fix this while keeping the implementation-defined epoch, every usage of Clock.real would have to be audited and deal with converting between epochs in a platform-specific way.Note also that Windows is the only odd-one out in the current implementation: