"Sun, 15 Dec 2024 18:18:40"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
20241215
Only TIME
18:18:40
General datetime
2024-12-15 18:18:40Z
For Database
2024-12-15 18:18:40
For HTTP1.1
Sun, 15 Dec 2024 18:18:40 GMT