"Thu, 01 Jan 1970 15:12:52"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700101
Only TIME
15:12:52
General datetime
1970-01-01 15:12:52Z
For Database
1970-01-01 15:12:52
For HTTP1.1
Thu, 01 Jan 1970 15:12:52 GMT