"Sat, 21 Jun 2025 19:05:36"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
20250621
Only TIME
19:05:36
General datetime
2025-06-21 19:05:36Z
For Database
2025-06-21 19:05:36
For HTTP1.1
Sat, 21 Jun 2025 19:05:36 GMT