Time of day filter

You could try this bit of code.

First start Bridge and navigate to your folder with the documents you want to select.

Next, Start ExtendScript Toolkit.

This utility can be found in the relevant folder:-
PC: C:\Program Files\Adobe\Adobe Utilities
MAC: <hard drive>/Applications/Utilities/Adobe Utilities

Copy and paste the script into ExtendScript Toolkit window and run the code (Debug - Run or the play Icon)

This should then look at all the files in the folder and if the hour is between 11 - 15 it will label the file as 'To Do'

#target bridge
//amend to suit
var startHour = 11;
var endHour = 15;
/////////////////////////////////////
if(ExternalObject.AdobeXMPScript == undefined) ExternalObject.AdobeXMPScript = new ExternalObject("lib:AdobeXMPScript");
var thumbs= app.document.visibleThumbnails;
for(var a =0;a<thumbs.length;a++){
if(thumbs.type != "file") continue;
var selectedFile = thumbs.spec;    
var myXmpFile = new XMPFile( selectedFile.fsName, XMPConst.UNKNOWN, XMPConst.OPEN_FOR_READ); 
myXmp = myXmpFile.getXMP();
var date = myXmp.getProperty(XMPConst.NS_PHOTOSHOP, "DateCreated");
var thisHour =new Date(Date.parse(date)).getHours();
if(thisHour == NaN ) continue;
if( thisHour >= startHour && thisHour <= endHour) thumbs.label = 'To Do';
}