UI: Add paste support to DateTimeInput component

airflow-core/src/airflow/ui/src/components/DateTimeInput.test.tsx

@@ -0,0 +1,134 @@
+/*!
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+import { fireEvent, render, screen } from "@testing-library/react";
+import { describe, it, expect, vi } from "vitest";
+
+import { TimezoneContext } from "src/context/timezone";
+import { Wrapper } from "src/utils/Wrapper";
+
+import { DateTimeInput } from "./DateTimeInput";
+
+describe("DateTimeInput paste", () => {
+  it("Pastes a valid datetime and fires onChange with UTC value", () => {
+    const onChange = vi.fn();
+
+    render(
+      <TimezoneContext.Provider value={{ selectedTimezone: "UTC", setSelectedTimezone: vi.fn() }}>
+        <DateTimeInput onChange={onChange} value="" />
+      </TimezoneContext.Provider>,
+      { wrapper: Wrapper },
+    );
+
+    const input = screen.getByTestId("datetime-input");
+    const pasteEvent = new ClipboardEvent("paste", {
+      clipboardData: new DataTransfer(),
+    });
+    Object.defineProperty(pasteEvent, "clipboardData", {
+      value: {
+        getData: vi.fn().mockReturnValue("2026-05-13 10:00:00"),
+      },
+    });
+
+    fireEvent(input, pasteEvent);
+
+    expect(onChange).toHaveBeenCalledTimes(1);
+    const callArg = onChange.mock.calls[0][0];
+    expect(callArg.target.value).toBe("2026-05-13T10:00:00.000Z");
+  });
+
+  it("Interprets timezone-less pasted values in the selected timezone", () => {
+    const onChange = vi.fn();
+
+    render(
+      <TimezoneContext.Provider
+        value={{ selectedTimezone: "America/New_York", setSelectedTimezone: vi.fn() }}
+      >
+        <DateTimeInput onChange={onChange} value="" />
+      </TimezoneContext.Provider>,
+      { wrapper: Wrapper },
+    );
+
+    const input = screen.getByTestId("datetime-input");
+    const pasteEvent = new ClipboardEvent("paste", {
+      clipboardData: new DataTransfer(),
+    });
+    Object.defineProperty(pasteEvent, "clipboardData", {
+      value: {
+        getData: vi.fn().mockReturnValue("2026-05-13 10:00:00"),
+      },
+    });
+
+    fireEvent(input, pasteEvent);
+
+    expect(onChange).toHaveBeenCalledTimes(1);
+    const callArg = onChange.mock.calls[0][0];
+    // 10:00 in New York (EDT, UTC-4) → 14:00 UTC
+    expect(callArg.target.value).toBe("2026-05-13T14:00:00.000Z");
+  });
+
+  it("Does not fire onChange for an invalid pasted string", () => {
+    const onChange = vi.fn();
+
+    render(
+      <TimezoneContext.Provider value={{ selectedTimezone: "UTC", setSelectedTimezone: vi.fn() }}>
+        <DateTimeInput onChange={onChange} value="" />
+      </TimezoneContext.Provider>,
+      { wrapper: Wrapper },
+    );
+
+    const input = screen.getByTestId("datetime-input");
+    const pasteEvent = new ClipboardEvent("paste", {
+      clipboardData: new DataTransfer(),
+    });
+    Object.defineProperty(pasteEvent, "clipboardData", {
+      value: {
+        getData: vi.fn().mockReturnValue("not a date"),
+      },
+    });
+
+    fireEvent(input, pasteEvent);
+
+    expect(onChange).not.toHaveBeenCalled();
+  });
+
+  it("Does not fire onChange for an empty pasted string", () => {
+    const onChange = vi.fn();
+
+    render(
+      <TimezoneContext.Provider value={{ selectedTimezone: "UTC", setSelectedTimezone: vi.fn() }}>
+        <DateTimeInput onChange={onChange} value="" />
+      </TimezoneContext.Provider>,
+      { wrapper: Wrapper },
+    );
+
+    const input = screen.getByTestId("datetime-input");
+    const pasteEvent = new ClipboardEvent("paste", {
+      clipboardData: new DataTransfer(),
+    });
+    Object.defineProperty(pasteEvent, "clipboardData", {
+      value: {
+        getData: vi.fn().mockReturnValue(""),
+      },
+    });
+
+    fireEvent(input, pasteEvent);
+
+    expect(onChange).not.toHaveBeenCalled();
+  });
+});

airflow-core/src/airflow/ui/src/components/DateTimeInput.tsx

@@ -19,7 +19,7 @@
 import { Input, type InputProps } from "@chakra-ui/react";
 import dayjs from "dayjs";
 import tz from "dayjs/plugin/timezone";
-import { forwardRef, type ChangeEvent, useState } from "react";
+import { forwardRef, type ChangeEvent, type ClipboardEvent, useState } from "react";
 import { useDebouncedCallback } from "use-debounce";
 
 import { useTimezone } from "src/context/timezone";
@@ -54,9 +54,22 @@ export const DateTimeInput = forwardRef<HTMLInputElement, Props>(({ onChange, va
     debounceDelay,
   );
 
+  const onPaste = (event: ClipboardEvent<HTMLInputElement>) => {
+    const pasted = event.clipboardData.getData("text");
+    if (!pasted) return;
+    const parsed = dayjs.tz(pasted, selectedTimezone);
+    if (!parsed.isValid()) return;
+    event.preventDefault();
+    const local = parsed.tz(selectedTimezone).format(DEFAULT_DATETIME_FORMAT);
+    const utc = parsed.toISOString();
+    setDisplayDate(local);
+    onChange?.({ ...event, target: { ...event.target, value: utc } } as unknown as ChangeEvent<HTMLInputElement>);
+  };
+
   return (
     <Input
       data-testid="datetime-input"
+      onPaste={onPaste}
       onChange={(event) => {
         const local = dayjs(event.target.value).isValid() ? event.target.value : "";