daysInMonth

daysInMonth(date) → number · Date & Time

Get the number of days in the month of the given date.

• date (required): a date or datetime value

{
  feb2026: daysInMonth(parseDate("2026-02-01", "yyyy-MM-dd")),   // 28
  feb2024: daysInMonth(parseDate("2024-02-01", "yyyy-MM-dd")),   // 29 (leap year)
  jan: daysInMonth(parseDate("2026-01-15", "yyyy-MM-dd"))        // 31
}