Time tracker. I need help!

Hello, everyone!
Guys, I need help. I must make a time tracker. It’s must-have the next functions:

  1. write a time of start
    2.write a time of the end
  2. calculate the time between start and end
    4.sum up time intervals for the day
    Can you help me with a plugin?

I don’t think you need a plugin, this can all be done on bubble.

Create an event table with time name, time start, time end, time total.

Build a timer page to start an stop the timer.