diff --git a/jquery.datetimepicker.js b/jquery.datetimepicker.js
index e0a267b..0f886df 100644
--- a/jquery.datetimepicker.js
+++ b/jquery.datetimepicker.js
@@ -167,7 +167,8 @@
 		roundTime:'round', // ceil, floor
 		className:'',
 		weekends	: 	[],
-		yearOffset:0
+		yearOffset:0,
+		beforeShowDay: function() { return [true,'']; }
 	};
 	// fix for ie8
 	if ( !Array.prototype.indexOf ) {
@@ -383,7 +384,7 @@
 						datepicker.addClass('active');
 					else
 						datepicker.removeClass('active');
-						
+
 					if( options.timepicker )
 						timepicker.addClass('active');
 					else
@@ -750,7 +751,7 @@
 							minDate = _xdsoft_datetime.strtodate(options.minDate);
 							minDate = new Date(minDate.getFullYear(),minDate.getMonth(),minDate.getDate());
 						}
-						var d,y,m,classes = [];
+						var d,y,m,classes = [],customDateSettings;
 						while( i<_xdsoft_datetime.currentTime.getDaysInMonth()||start.getDay()!=options.dayOfWeekStart||_xdsoft_datetime.currentTime.getMonth()==start.getMonth() ) {
 							classes = [];
 							i++;
@@ -763,6 +764,15 @@
 								classes.push('xdsoft_disabled');
 							}
 
+							customDateSettings = options.beforeShowDay.call(datetimepicker, start);
+							if ( customDateSettings[0] === false ) {
+								classes.push('xdsoft_disabled');
+							}
+
+							if ( customDateSettings[1] != "" ) {
+								classes.push(customDateSettings[1]);
+							}
+
 							if( _xdsoft_datetime.currentTime.getMonth()!=m ) classes.push('xdsoft_other_month');
 
 							if( (options.defaultSelect||datetimepicker.data('changed')) && _xdsoft_datetime.currentTime.dateFormat('d.m.Y')==start.dateFormat('d.m.Y') ) {