"Fri, 09 Jan 1970 14:42:21"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700109
Only TIME
14:42:21
General datetime
1970-01-09 14:42:21Z
For Database
1970-01-09 14:42:21
For HTTP1.1
Fri, 09 Jan 1970 14:42:21 GMT