"Sun, 04 Jan 1970 03:03:54"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700104
Only TIME
03:03:54
General datetime
1970-01-04 03:03:54Z
For Database
1970-01-04 03:03:54
For HTTP1.1
Sun, 04 Jan 1970 03:03:54 GMT