"Thu, 01 Jan 1970 00:38:27"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700101
Only TIME
00:38:27
General datetime
1970-01-01 00:38:27Z
For Database
1970-01-01 00:38:27
For HTTP1.1
Thu, 01 Jan 1970 00:38:27 GMT