"Sat, 14 Feb 1970 21:42:58"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700214
Only TIME
21:42:58
General datetime
1970-02-14 21:42:58Z
For Database
1970-02-14 21:42:58
For HTTP1.1
Sat, 14 Feb 1970 21:42:58 GMT