"Thu, 01 Jan 1970 21:46:21"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700101
Only TIME
21:46:21
General datetime
1970-01-01 21:46:21Z
For Database
1970-01-01 21:46:21
For HTTP1.1
Thu, 01 Jan 1970 21:46:21 GMT