"Sat, 07 Feb 1970 21:42:47"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700207
Only TIME
21:42:47
General datetime
1970-02-07 21:42:47Z
For Database
1970-02-07 21:42:47
For HTTP1.1
Sat, 07 Feb 1970 21:42:47 GMT