"Tue, 06 Jan 1970 21:38:58"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700106
Only TIME
21:38:58
General datetime
1970-01-06 21:38:58Z
For Database
1970-01-06 21:38:58
For HTTP1.1
Tue, 06 Jan 1970 21:38:58 GMT