The calendar pop up for start and end date is limited and slow as there is a minor lag when pressing the start and end buttons. The end date opens up at the current date, when it should at least open up at the start date as it has to be after this.

Basic calendar tools should be easy to implement. this includes

being able to type in a date (old school, but works)

being able to add xx days\weeks\months etc for an immediate end date. this is handy as a lot of end dates in practice are +60 or +30 days or +8 weeks