"Sun, 18 Jan 1970 12:02:01"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700118
Only TIME
12:02:01
General datetime
1970-01-18 12:02:01Z
For Database
1970-01-18 12:02:01
For HTTP1.1
Sun, 18 Jan 1970 12:02:01 GMT