how to automate ant time picker using selenium web driver and java?

Question

In my application, there are few ant time pickers(https://ant.design/components/time-picker/) used in the forms. I'm experiencing the following behavior,

"OK" button of the start time is working properly.

using the below coding part,

shiftStartHrs.click();
    shiftStartHrs.sendKeys(starttime);
    Thread.sleep(3000);
    new Actions(driver).moveToElement(shiftStartOkBtn).perform();
    shiftStartOkBtn.click();

But the end-time selection is not working,

Thanks in advance for any suggestions.