diff --git a/packages/calcite-components/src/components/input-date-picker/input-date-picker.tsx b/packages/calcite-components/src/components/input-date-picker/input-date-picker.tsx
index 185ccdd35f6..f2bbe700d71 100644
--- a/packages/calcite-components/src/components/input-date-picker/input-date-picker.tsx
+++ b/packages/calcite-components/src/components/input-date-picker/input-date-picker.tsx
@@ -468,6 +468,7 @@ export class InputDatePicker
   connectedCallback(): void {
     connectInteractive(this);
     connectLocalized(this);
+    this.handleDateTimeFormatChange();
 
     const { open } = this;
     open && this.openHandler();