"Sun, 18 Jan 1970 07:51:40"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700118
Only TIME
07:51:40
General datetime
1970-01-18 07:51:40Z
For Database
1970-01-18 07:51:40
For HTTP1.1
Sun, 18 Jan 1970 07:51:40 GMT