### Steps to reproduce

1. Begin of the insertionEnable "Allow exact times tracking" in Administration > Times and Costs > Defaults

2. Go to "My time tracking" in a project with "times and costs" module enabled

3. End of the insertion Set your user account to a different timezone than your computer's system timezone

Begin of the insertion4.End of the insertion Begin of the deletion 2.End of the deletion Have some logged time entries with start Begin of the insertionandEnd of the insertion Begin of the deletion &End of the deletion end times

Begin of the insertion5.End of the insertion Begin of the deletion 3.End of the deletion Go to the my time tracking calendar


### What is the buggy behavior?

* The slot and the shown times on the card do not match up

* Creating a new time entry by selecting in the calendar will have different times than the selected times prefilled in the modal

* Dragging a calendar event and then refreshing the page will show the event at a different time than it was dragged to


### What is the expected behavior?

1. Times and slots do match up (when showing an event in the 7:00-8:00 slot, the time on the the card should also show that)

2. When selecting in the calendar, the modal should show those selected times prefilled

3. when dragging an event, it should stay at the same spot when reloading the calendar