"Sat, 18 May 2024 18:21:51"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
20240518
Only TIME
18:21:51
General datetime
2024-05-18 18:21:51Z
For Database
2024-05-18 18:21:51
For HTTP1.1
Sat, 18 May 2024 18:21:51 GMT