fix(DateInput3): Fix wrong today date for timezone mismatch

packages/datetime2/src/components/date-input3/dateInput3.tsx

@@ -290,6 +290,7 @@ export const DateInput3: React.FC<DateInput3Props> = React.memo(function _DateIn
                 onShortcutChange={handleShortcutChange}
                 selectedShortcutIndex={selectedShortcutIndex}
                 timePrecision={timePrecision}
+                timezone={timezoneValue}
                 // the rest of this component handles invalid dates gracefully (to show error messages),
                 // but DatePicker does not, so we must take care to filter those out
                 value={isErrorState ? null : valueAsDate}

packages/datetime2/src/components/date-picker3/datePicker3.tsx

@@ -28,6 +28,7 @@ import {
     DateUtils,
     Errors,
     TimePicker,
+    TimezoneUtils,
 } from "@blueprintjs/datetime";
 
 import { Classes, dayPickerClassNameOverrides } from "../../classes";
@@ -355,7 +356,9 @@ export class DatePicker3 extends DateFnsLocalizedComponent<DatePicker3Props, Dat
     };
 
     private handleTodayClick = () => {
-        const value = new Date();
+        const { timezone } = this.props;
+        const today = new Date();
+        const value = timezone != null ? TimezoneUtils.convertLocalDateToTimezoneTime(today, timezone) : today;
         const displayMonth = value.getMonth();
         const displayYear = value.getFullYear();
         const selectedDay = value.getDate();

packages/datetime2/src/components/date-picker3/datePicker3Props.ts

@@ -45,4 +45,14 @@ export interface DatePicker3Props extends DatePickerSharedProps, DateFnsLocalePr
      * The currently selected day. If this prop is provided, the component acts in a controlled manner.
      */
     value?: Date | null;
+
+    /**
+     * The currently selected timezone UTC identifier, e.g. "Pacific/Honolulu".
+     *
+     * This prop is only used to determine what date should be selected when clicking the "Today" button in the actions
+     * bar. If this value is omitted, the current date will be set using the user's local timezone.
+     *
+     * See [IANA Time Zones](https://www.iana.org/time-zones).
+     */
+    timezone?: string;
 }