Date picker
When you click in a date box, the date picker appears with a calendar. This may show the date that was already in the box or today’s date or another date (depending on the situation). The date can be changed although some dates may be greyed out because they cannot be selected.
If the year and month are correct, just select the day you want.
Month picker
If the year and month are almost right, you can click on the left or right arrows at the top of the date picker to move to the previous or following month. A few clicks will move you several months.
Year picker
If the date is a long way from the date you need, click on the month and year. If the year is correct, select the month you want. If the year is incorrect, click on the year and a range of years will appear. If this is what you need, select it. To go to the previous or next decade, use the left or right arrows at the top of the date picker.