Fix date overflow when parsing year-month format without day #1580
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When parsing date formats like "2026-02" that don't specify a day, DateTime::createFromFormat() was using the current day (29th) from the system date. This caused February 2026 to overflow to March 1st since February 2026 only has 28 days.
Adding the '!' prefix resets all date components to Unix Epoch before parsing, ensuring the day defaults to 1 instead of using the current day.