"Sun, 18 Jan 1970 18:12:45"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700118
Only TIME
18:12:45
General datetime
1970-01-18 18:12:45Z
For Database
1970-01-18 18:12:45
For HTTP1.1
Sun, 18 Jan 1970 18:12:45 GMT