Merge timelib 2021.12 and add tests#8589

Merged

derickr merged 8 commits intophp:PHP-8.1from

derickr:merge-timelib-2021.12-and-add-tests

May 20, 2022

Commits on May 20, 2022

Integrate timelib 2021.12
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Adjust existing tests for fixed bugs
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Fixed bug GH-7758 (Problems with negative timestamps and fractions)
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Fixed bug #66019 (DateTime object does not support short ISO 8601 time format - YYYY-MM-DDTHH)
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Fixed bug #68549 (Timezones and offsets are not properly used when working with dates)
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Fixed bug #51934 (strtotime plurals / incorrect time)
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Fixed bug #51987 (Datetime fails to parse an ISO 8601 ordinal date (extended format))
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Fixed bug #81565 (date parsing fails when provided with timezones including seconds)
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