Node Post Date equals to selected date only not time?
Install the date module and enable the "Date Views" module, which is a sub-module of the date module.
To your view add the filter "Date: Date (node)".
For the "Date selection form element" option set it to whatever you like.
For the "Filter granularity" option set it to "Day".
Set the "Starting year" option to whatever is relevant.
For the "Date field(s)" option select "Content: Post date"
For the "Method" option, generally leave it set to "OR"
Click the apply button, then continue to configure as you would normally.