Validates whether a given year, 1-indexed month, and day constitute a valid calendar date in the Gregorian calendar.
The full calendar year (e.g. 2026)
The 1-indexed month number (1..12)
The 1-indexed day of the month (1..31)
true if the year, month, and day represent a valid date, otherwise false
true
false
Validates whether a given year, 1-indexed month, and day constitute a valid calendar date in the Gregorian calendar.