Hi, so I've tested this on my mac and you can enter the date without using the drop down by either highlighting the day, month or year and then either scrolling on the mouse or using the keyboard arrow keys. When entering the numbers manually you aren't allowed to enter a date before the current date so sometimes it wont let you change days or months first depending on the month. It felt unintuitive when I was trying to manually enter dates to I enabled the dropdown but that shouldn't prevent you from entering manually, just that if you try entering a number that is invalid or before the current date time it just wont let you enter it.