"Sat, 14 Feb 1970 04:42:33"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700214
Only TIME
04:42:33
General datetime
1970-02-14 04:42:33Z
For Database
1970-02-14 04:42:33
For HTTP1.1
Sat, 14 Feb 1970 04:42:33 GMT