diff --git a/projects/datetime-picker/src/lib/datetime-picker-input-v2.directive.ts b/projects/datetime-picker/src/lib/datetime-picker-input-v2.directive.ts
index 8b539c12..2375020e 100644
--- a/projects/datetime-picker/src/lib/datetime-picker-input-v2.directive.ts
+++ b/projects/datetime-picker/src/lib/datetime-picker-input-v2.directive.ts
@@ -119,10 +119,10 @@ export class NgxMatDatetimePickerInputV2<D>
 
   /** Function that can be used to filter out dates within the datepicker. */
   @Input()
-  get dateFilter(): (date: D) => boolean {
+  get dateFilter(): (date: D | null) => boolean {
     return this._dateFilter();
   }
-  set dateFilter(value: (date: D) => boolean) {
+  set dateFilter(value: (date: D | null) => boolean) {
     const wasMatchingValue = this._matchesFilter(this.value);
     this._dateFilter.set(value);
     if (this._matchesFilter(this.value) !== wasMatchingValue) {