"Sun, 25 Jan 1970 07:49:21"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700125
Only TIME
07:49:21
General datetime
1970-01-25 07:49:21Z
For Database
1970-01-25 07:49:21
For HTTP1.1
Sun, 25 Jan 1970 07:49:21 GMT