How Long Until

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Years from today

Keep month and day when valid. Leap-day sources clamp in common years.

Leap-day rule

The destination year is tested with the Gregorian leap rule. If February has 28 days, 29 becomes 28. No date is invented.

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Leap day plus one year?

29 February 2024 + 1 year = 28 February 2025. + 4 years returns 29 February 2028.

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