Hello, I have a question: if I book an exam A using a voucher, but then I have to cancel the exam and would like to book an exam B using that voucher, can I do it? Or can I no longer use the voucher even if I canceled exam A? Thanks.

I was looking for a simple way to calculate working hours and time differences without doing the calculation manually. This tool was useful for quickly checking total hours:

https://calculio.es/

It may also be helpful for anyone dealing with work schedules or time-based calculations.