diff --git a/types/pikaday/index.d.ts b/types/pikaday/index.d.ts
index fad074ae33..2233fa9b4c 100644
--- a/types/pikaday/index.d.ts
+++ b/types/pikaday/index.d.ts
@@ -44,7 +44,7 @@ declare class Pikaday {
      * can optionally be passed as the second parameter to prevent triggering
      * of the onSelect callback, allowing the date to be set silently.
      */
-    setDate(date: string | Date, preventOnSelect?: boolean): void;
+    setDate(date: string | Date | null, preventOnSelect?: boolean): void;
 
     /**
      * Returns a Moment.js object for the selected date (Moment must be
@@ -101,13 +101,13 @@ declare class Pikaday {
      * Update the range start date. For using two Pikaday instances to
      * select a date range.
      */
-    setStartRange(date: Date): void;
+    setStartRange(date: Date | null): void;
 
     /**
      * Update the range end date. For using two Pikaday instances to select
      * a date range.
      */
-    setEndRange(date: Date): void;
+    setEndRange(date: Date | null): void;
 
     /**
      * Update the HTML.
@@ -138,6 +138,11 @@ declare class Pikaday {
      * Hide the picker and remove all event listeners - no going back!
      */
     destroy(): void;
+
+    /**
+     * Clear and reset the date
+     */
+    clear(): void;
 }
 
 // merge the Pikaday class declaration with a module
diff --git a/types/pikaday/pikaday-tests.ts b/types/pikaday/pikaday-tests.ts
index 7a532efb6f..230104daf7 100644
--- a/types/pikaday/pikaday-tests.ts
+++ b/types/pikaday/pikaday-tests.ts
@@ -31,6 +31,8 @@ new Pikaday({field: $('#datepicker')[0]});
     picker.getDate();
     picker.setDate('2015-01-01');
     picker.setDate('2015-01-01', true);
+    picker.setDate(null);
+    picker.setDate(null, true);
     picker.getMoment();
     picker.setMoment(moment('14th February 2014', 'DDo MMMM YYYY'));
     picker.setMoment(moment('14th February 2014', 'DDo MMMM YYYY'), true);
@@ -45,11 +47,14 @@ new Pikaday({field: $('#datepicker')[0]});
     picker.setMinDate(null);
     picker.setMaxDate(null);
     picker.setStartRange(new Date());
+    picker.setStartRange(null);
     picker.setEndRange(new Date());
+    picker.setEndRange(null);
     picker.isVisible();
     picker.show();
     picker.adjustPosition();
     picker.hide();
+    picker.clear();
     picker.destroy();
 })();