あの日は何曜日？

When you enter year, month, day, the day of the week is displayed.

The year's input corresponds to 5 AD, Meiji, Taisho, Showa, Heisei.

"What day of the week is my birthday?"

"When you create a report, it is troublesome to look up the day of the week on the calendar"

It is useful when saying.