"Sun, 18 Jan 1970 01:00:54"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700118
Only TIME
01:00:54
General datetime
1970-01-18 01:00:54Z
For Database
1970-01-18 01:00:54
For HTTP1.1
Sun, 18 Jan 1970 01:00:54 GMT