"Wed, 20 May 1970 07:11:21"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700520
Only TIME
07:11:21
General datetime
1970-05-20 07:11:21Z
For Database
1970-05-20 07:11:21
For HTTP1.1
Wed, 20 May 1970 07:11:21 GMT