"Sun, 15 Jun 2025 19:05:38"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
20250615
Only TIME
19:05:38
General datetime
2025-06-15 19:05:38Z
For Database
2025-06-15 19:05:38
For HTTP1.1
Sun, 15 Jun 2025 19:05:38 GMT