"Sun, 18 Jan 1970 12:33:08"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700118
Only TIME
12:33:08
General datetime
1970-01-18 12:33:08Z
For Database
1970-01-18 12:33:08
For HTTP1.1
Sun, 18 Jan 1970 12:33:08 GMT