"Sat, 14 Feb 1970 23:32:12"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700214
Only TIME
23:32:12
General datetime
1970-02-14 23:32:12Z
For Database
1970-02-14 23:32:12
For HTTP1.1
Sat, 14 Feb 1970 23:32:12 GMT