"Sun, 15 Jun 2025 19:05:44"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
20250615
Only TIME
19:05:44
General datetime
2025-06-15 19:05:44Z
For Database
2025-06-15 19:05:44
For HTTP1.1
Sun, 15 Jun 2025 19:05:44 GMT