Allow clicking on dates outside on current month in calendar

When assigning a task to a contact, you set the date using the calendar dropdown, which shows current month dates, then any dates from previous month or the next month in grey numbers. It doesn't allow you to click on these grey numbers, so you have to move forward or backwards to select the right month first. Most other programs allow you to click on any date shown - I common example of this is Microsoft. Not major but just slightly frustrating.