"Sat, 14 Feb 1970 18:27:12"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700214
Only TIME
18:27:12
General datetime
1970-02-14 18:27:12Z
For Database
1970-02-14 18:27:12
For HTTP1.1
Sat, 14 Feb 1970 18:27:12 GMT