feat: changed date format at datetime picker

Signed-off-by: NaYeong,Kim <[email protected]>

Author: skdud4659

Diff for: packages/mirinae/src/controls/datetime-picker/PDatetimePicker.vue

@@ -212,8 +212,8 @@ export default defineComponent({
                     mode: state.mode,
                     defaultDate,
                     altInput: false,
-                    altFormat: state.enableTime ? 'Y/m/d H:i' : 'Y/m/d',
-                    dateFormat: state.enableTime ? 'Y/m/d H:i' : 'Y/m/d',
+                    altFormat: state.enableTime ? 'Y-m-d H:i' : 'Y-m-d',
+                    dateFormat: state.enableTime ? 'Y-m-d H:i' : 'Y-m-d',
                     enableTime: state.enableTime,
                     minDate: props.minDate,
                     maxDate: props.maxDate,