"Sun, 18 Jan 1970 09:15:46"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700118
Only TIME
09:15:46
General datetime
1970-01-18 09:15:46Z
For Database
1970-01-18 09:15:46
For HTTP1.1
Sun, 18 Jan 1970 09:15:46 GMT