"Sun, 04 Jan 1970 05:50:38"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700104
Only TIME
05:50:38
General datetime
1970-01-04 05:50:38Z
For Database
1970-01-04 05:50:38
For HTTP1.1
Sun, 04 Jan 1970 05:50:38 GMT