"Sun, 18 Jan 1970 07:49:16"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700118
Only TIME
07:49:16
General datetime
1970-01-18 07:49:16Z
For Database
1970-01-18 07:49:16
For HTTP1.1
Sun, 18 Jan 1970 07:49:16 GMT