diff --git a/DateTime.js b/DateTime.js
index 40b11bd6b..1ab602748 100644
--- a/DateTime.js
+++ b/DateTime.js
@@ -396,10 +396,25 @@ var Datetime = createClass({
 		this.updateSelectedDate(e);
 	},
 
+	alwaysValidDate: function () {
+		return true;
+	},
+
 	renderTodayButton: function (key) {
+		var now = moment(new Date());
+		var date = this.state.viewDate.clone()
+			.month( now.month() )
+			.date( now.date() )
+			.year( now.year() );
+
+		var isValidDate = this.props.isValidDate || this.alwaysValidDate;
+
+		var isValid = date.isValid && isValidDate(date);
+		var classes = isValid ? 'rdtTodayButton' : 'rdtTodayButton rdtDisabled';
+
 		return this.props.showTodayButton ? React.createElement(
 			'button',
-			{key: key, className: 'rdtTodayButton', onClick: this.goToToday, 'data-value': '10'},
+			{key: key, className: classes, onClick: isValid ? this.goToToday : undefined},
 			'Today'
 		) : undefined;
 	},
diff --git a/css/react-datetime.css b/css/react-datetime.css
index cfccca8a7..6e83c1aa0 100644
--- a/css/react-datetime.css
+++ b/css/react-datetime.css
@@ -225,4 +225,9 @@ td.rdtYear:hover {
 
 .rdtTodayButton:focus {
     outline: none;
+}
+
+.rdtTodayButton.rdtDisabled {
+    color: #999999;
+    cursor: not-allowed;
 }
\ No newline at end of file
diff --git a/example/example.js b/example/example.js
index 780d125c9..d20f14e53 100644
--- a/example/example.js
+++ b/example/example.js
@@ -6,7 +6,11 @@ ReactDOM.render(
 	React.createElement(DateTime, {
 		viewMode: 'days',
 		dateFormat: 'MM/DD/YY',
-		showTodayButton: true
+		showTodayButton: true,
+		closeOnSelect: true,
+		isValidDate: function(current) {
+			return current.isBefore(DateTime.moment().startOf('month'));
+		}
 	}),
 	document.getElementById('datetime')
 );
diff --git a/example/react-datetime.css b/example/react-datetime.css
index 1b4ad88dc..82d9844e8 100644
--- a/example/react-datetime.css
+++ b/example/react-datetime.css
@@ -234,4 +234,9 @@ td.rdtYear:hover {
 
 .rdtTodayButton:focus {
     outline: none;
+}
+
+.rdtTodayButton.rdtDisabled {
+    color: #999999;
+    cursor: not-allowed;
 }
\ No newline at end of file
diff --git a/test/tests.spec.js b/test/tests.spec.js
index 94752fd2d..3c3cd113f 100644
--- a/test/tests.spec.js
+++ b/test/tests.spec.js
@@ -36,6 +36,18 @@ describe('Datetime', () => {
 		expect(onChangeFn).toHaveBeenCalled();
 	});
 
+	it('disables today button is today is not a valid date', () => {
+		const component = utils.createDatetime({ showTodayButton: true,
+			dateFormat: 'MM/DD/YYYY', timeFormat: false, isValidDate: function(current) {
+				return current.isBefore(moment().startOf('month'));
+			} });
+		const onChangeFn = jest.fn();
+
+		expect(component.find('.rdtTodayButton').hasClass('rdtDisabled')).toBeTruthy();
+		utils.clickOnElement(component.find('.rdtTodayButton'));
+		expect(onChangeFn).not.toHaveBeenCalled();
+	});
+
 	it('viewMode=days: renders days, week days, month, year', () => {
 		const date = new Date(2000, 0, 15, 2, 2, 2, 2),
 			component = utils.createDatetime({ viewMode: 'days', defaultValue: date });