Unix timestamp in milliseconds
Format string (e.g., "Y-M1-D1", "D2.M2.Y", "Ms D1, Y")
Formatted date string matching the original input format
formatDateString(1703462400000, 'Y-M1-D1') // '2023-12-25'
formatDateString(1703462400000, 'D1.M1.Y') // '25.12.2023'
formatDateString(1703462400000, 'Ms D1, Y') // 'Dec 25, 2023'
formatDateString(1701388800000, 'Y-M1') // '2023-12'
formatDateString(1640390400000, 'M1-D1') // '12-25'
formatDateString(1703462400000, 'D2/M2/Y') // '25/12/2023'
formatDateString(1703462400000, 'Mf D1, Y') // 'December 25, 2023'
Formats a Unix timestamp according to the specified format string. This is the reverse operation of parseDateString.