"Tue, 13 Jan 1970 23:38:39"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700113
Only TIME
23:38:39
General datetime
1970-01-13 23:38:39Z
For Database
1970-01-13 23:38:39
For HTTP1.1
Tue, 13 Jan 1970 23:38:39 GMT