"Sat, 14 Feb 1970 12:02:34"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700214
Only TIME
12:02:34
General datetime
1970-02-14 12:02:34Z
For Database
1970-02-14 12:02:34
For HTTP1.1
Sat, 14 Feb 1970 12:02:34 GMT