"Sun, 25 Jan 1970 18:15:52"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700125
Only TIME
18:15:52
General datetime
1970-01-25 18:15:52Z
For Database
1970-01-25 18:15:52
For HTTP1.1
Sun, 25 Jan 1970 18:15:52 GMT