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toLocaleString() returns an arbitrary human-readable string. For instance, in France it returns "18/02/2025 13:32:08" and in Korea it returns "2025. 2. 18. 오후 1:32:08".
The string cannot be used for anything else than display. Trying to extract the date from it will not work: substring(0, 10) will give "2025. 2. 1" in Korea (dropping the "8"). As a result, any day with the same first digit will be interpreted as equal.
Fix this by comparing the year, month, and day of the month instead.