Timers household appliances

The application is designed to calculate the time required when setting a delayed start on household appliances. Let's say you need the washing machine to finish washing at 7 o'clock in the morning, for this in the evening you need to count the time and set the delay start timer so that the washing machine starts the washing program taking into account the operation time and ends the operation by 7 o'clock in the morning.
This application calculates the delay start time in real time,
You need to set the operation time, let's say the washing program takes 1 hour 20 minutes,
then set the end time of the operation, let's say you want the wash to end at 8 am,
the application will calculate the time that must be set in the delayed start of the washing machine, in this case, if the real time is 8 pm, the delayed start must be set at 10 hours and 40 minutes.
If the delay start timer is in 1 hour increments, then the application, in red font, will offer two options for setting the timer