"Sat, 14 Feb 1970 00:20:38"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700214
Only TIME
00:20:38
General datetime
1970-02-14 00:20:38Z
For Database
1970-02-14 00:20:38
For HTTP1.1
Sat, 14 Feb 1970 00:20:38 GMT