"Sun, 18 Jan 1970 11:08:45"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700118
Only TIME
11:08:45
General datetime
1970-01-18 11:08:45Z
For Database
1970-01-18 11:08:45
For HTTP1.1
Sun, 18 Jan 1970 11:08:45 GMT