"Sat, 14 Feb 1970 07:54:42"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700214
Only TIME
07:54:42
General datetime
1970-02-14 07:54:42Z
For Database
1970-02-14 07:54:42
For HTTP1.1
Sat, 14 Feb 1970 07:54:42 GMT