"Fri, 06 Feb 1970 19:40:47"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700206
Only TIME
19:40:47
General datetime
1970-02-06 19:40:47Z
For Database
1970-02-06 19:40:47
For HTTP1.1
Fri, 06 Feb 1970 19:40:47 GMT