"Sun, 18 Jan 1970 01:00:50"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700118
Only TIME
01:00:50
General datetime
1970-01-18 01:00:50Z
For Database
1970-01-18 01:00:50
For HTTP1.1
Sun, 18 Jan 1970 01:00:50 GMT