"Sat, 21 Jun 2025 19:05:49"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
20250621
Only TIME
19:05:49
General datetime
2025-06-21 19:05:49Z
For Database
2025-06-21 19:05:49
For HTTP1.1
Sat, 21 Jun 2025 19:05:49 GMT