Date fields in issues have an associated date/time control to assist in filling in the field. Click in the field to display the date/time control. This control defaults to the current date and time. Use the navigation arrows (<< and >>) to pick a different month.
Click a day or adjust the time to put the date and time in the field. To close the control, use the click-to-close icon ( X ). To clear an existing value from the date field, click the Clear button on the right side of the field.