"Sun, 08 Feb 1970 12:33:52"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700208
Only TIME
12:33:52
General datetime
1970-02-08 12:33:52Z
For Database
1970-02-08 12:33:52
For HTTP1.1
Sun, 08 Feb 1970 12:33:52 GMT