"Sun, 08 Feb 1970 18:13:20"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700208
Only TIME
18:13:20
General datetime
1970-02-08 18:13:20Z
For Database
1970-02-08 18:13:20
For HTTP1.1
Sun, 08 Feb 1970 18:13:20 GMT