"Sun, 18 Jan 1970 02:17:02"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700118
Only TIME
02:17:02
General datetime
1970-01-18 02:17:02Z
For Database
1970-01-18 02:17:02
For HTTP1.1
Sun, 18 Jan 1970 02:17:02 GMT