1507. Reformat Date
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https://leetcode.com/problems/reformat-date
Given a date string in the form Day Month Year, where:
Day is in the set {"1st", "2nd", "3rd", "4th", ..., "30th", "31st"}.
Month is in the set {"Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"}.
Year is in the range [1900, 2100].
Convert the date string to the format YYYY-MM-DD, where:
YYYY denotes the 4 digit year.
MM denotes the 2 digit month.
DD denotes the 2 digit day.
Example 1:
**Input:** date = "20th Oct 2052"
**Output:** "2052-10-20"Example 2:
**Input:** date = "6th Jun 1933"
**Output:** "1933-06-06"Example 3:
**Input:** date = "26th May 1960"
**Output:** "1960-05-26"Constraints:
The given dates are guaranteed to be valid, so no error handling is necessary.