"Sat, 14 Feb 1970 18:13:02"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700214
Only TIME
18:13:02
General datetime
1970-02-14 18:13:02Z
For Database
1970-02-14 18:13:02
For HTTP1.1
Sat, 14 Feb 1970 18:13:02 GMT