[pp/FFmpegMetadata] Convert date strings to ISO 8601#12253

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7x11x13 wants to merge 2 commits intoyt-dlp:masterfrom 7x11x13:iso8601-date-metadata

+5-3

Commits on Feb 1, 2025

Convert date strings to ISO 8601 before adding to metadata
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Commits on Feb 2, 2025

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7x11x13
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