"Sun, 18 Jan 1970 11:04:15"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700118
Only TIME
11:04:15
General datetime
1970-01-18 11:04:15Z
For Database
1970-01-18 11:04:15
For HTTP1.1
Sun, 18 Jan 1970 11:04:15 GMT