"Sun, 18 Jan 1970 21:43:25"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700118
Only TIME
21:43:25
General datetime
1970-01-18 21:43:25Z
For Database
1970-01-18 21:43:25
For HTTP1.1
Sun, 18 Jan 1970 21:43:25 GMT