"Sun, 25 Jan 1970 21:44:23"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700125
Only TIME
21:44:23
General datetime
1970-01-25 21:44:23Z
For Database
1970-01-25 21:44:23
For HTTP1.1
Sun, 25 Jan 1970 21:44:23 GMT