"Sat, 15 Jun 2024 21:30:20"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
20240615
Only TIME
21:30:20
General datetime
2024-06-15 21:30:20Z
For Database
2024-06-15 21:30:20
For HTTP1.1
Sat, 15 Jun 2024 21:30:20 GMT