"Sun, 18 Jan 1970 15:20:26"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700118
Only TIME
15:20:26
General datetime
1970-01-18 15:20:26Z
For Database
1970-01-18 15:20:26
For HTTP1.1
Sun, 18 Jan 1970 15:20:26 GMT