"Fri, 13 Feb 1970 19:40:51"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700213
Only TIME
19:40:51
General datetime
1970-02-13 19:40:51Z
For Database
1970-02-13 19:40:51
For HTTP1.1
Fri, 13 Feb 1970 19:40:51 GMT