"Fri, 09 Jan 1970 17:11:21"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700109
Only TIME
17:11:21
General datetime
1970-01-09 17:11:21Z
For Database
1970-01-09 17:11:21
For HTTP1.1
Fri, 09 Jan 1970 17:11:21 GMT