"Sun, 18 Jan 1970 21:43:24"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700118
Only TIME
21:43:24
General datetime
1970-01-18 21:43:24Z
For Database
1970-01-18 21:43:24
For HTTP1.1
Sun, 18 Jan 1970 21:43:24 GMT