"Sun, 04 Jan 1970 00:38:04"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700104
Only TIME
00:38:04
General datetime
1970-01-04 00:38:04Z
For Database
1970-01-04 00:38:04
For HTTP1.1
Sun, 04 Jan 1970 00:38:04 GMT