The date function on the calendar will only pull photos for that day now depending on your server time and php's getdate function
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Now as far as showing dates correctly in Photopost with VB
you must need to set Photopost's GMT setting to opposite of your servers offset like so. My server is in mountain time USA which is -7 from GMT so to get times to show like vb
format in Photopost in my GMT setting in admin I put a 7 in there to bring it back to 7. That should then display times correct