"Sat, 14 Feb 1970 12:03:37"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700214
Only TIME
12:03:37
General datetime
1970-02-14 12:03:37Z
For Database
1970-02-14 12:03:37
For HTTP1.1
Sat, 14 Feb 1970 12:03:37 GMT