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docs(clock): add snippets for 'Test with predefined time' for ports (#36393)

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docs/src/clock.md
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@ -64,6 +64,47 @@ await page.clock.setFixedTime(new Date('2024-02-02T10:30:00'));
await expect(page.getByTestId('current-time')).toHaveText('2/2/2024, 10:30:00 AM');
```
```python async
await page.clock.set_fixed_time(datetime.datetime(2024, 2, 2, 10, 0, 0))
await page.goto("http://localhost:3333")
await expect(page.get_by_test_id("current-time")).to_have_text("2/2/2024, 10:00:00 AM")
await page.clock.set_fixed_time(datetime.datetime(2024, 2, 2, 10, 30, 0))
# We know that the page has a timer that updates the time every second.
await expect(page.get_by_test_id("current-time")).to_have_text("2/2/2024, 10:30:00 AM")
```
```python sync
page.clock.set_fixed_time(datetime.datetime(2024, 2, 2, 10, 0, 0))
page.goto("http://localhost:3333")
expect(page.get_by_test_id("current-time")).to_have_text("2/2/2024, 10:00:00 AM")
page.clock.set_fixed_time(datetime.datetime(2024, 2, 2, 10, 30, 0))
# We know that the page has a timer that updates the time every second.
expect(page.get_by_test_id("current-time")).to_have_text("2/2/2024, 10:30:00 AM")
```
```java
SimpleDateFormat format = new SimpleDateFormat("yyy-MM-dd'T'HH:mm:ss");
page.clock().setFixedTime(format.parse("2024-02-02T10:00:00"));
page.navigate("http://localhost:3333");
Locator locator = page.getByTestId("current-time");
assertThat(locator).hasText("2/2/2024, 10:00:00 AM");
page.clock().setFixedTime(format.parse("2024-02-02T10:30:00"));
// We know that the page has a timer that updates the time every second.
assertThat(locator).hasText("2/2/2024, 10:30:00 AM");
```
```csharp
// Set the fixed time for the clock.
await Page.Clock.SetFixedTimeAsync(new DateTime(2024, 2, 2, 10, 0, 0));
await Page.GotoAsync("http://localhost:3333");
await Expect(Page.GetByTestId("current-time")).ToHaveTextAsync("2/2/2024, 10:00:00 AM");
// Set the fixed time for the clock.
await Page.Clock.SetFixedTimeAsync(new DateTime(2024, 2, 2, 10, 30, 0));
// We know that the page has a timer that updates the time every second.
await Expect(Page.GetByTestId("current-time")).ToHaveTextAsync("2/2/2024, 10:30:00 AM");
```
## Consistent time and timers
Sometimes your timers depend on `Date.now` and are confused when the `Date.now` value does not change over time.