Time systems, calendar references, and timezone tools.

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Before you send a message

The most useful reports are specific. They let us reproduce the problem, verify the expected result, and fix the page quickly.

Bug reports

Include the page URL, your timezone, your browser or device, the value you saw, and the value you expected to see.

Editorial corrections

If you think a definition, explanation, or example is wrong, include the exact sentence and what should replace it.

Privacy note

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