"Sun, 15 Dec 2024 21:18:00"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
20241215
Only TIME
21:18:00
General datetime
2024-12-15 21:18:00Z
For Database
2024-12-15 21:18:00
For HTTP1.1
Sun, 15 Dec 2024 21:18:00 GMT