"Sun, 11 Jan 1970 15:13:06"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700111
Only TIME
15:13:06
General datetime
1970-01-11 15:13:06Z
For Database
1970-01-11 15:13:06
For HTTP1.1
Sun, 11 Jan 1970 15:13:06 GMT