It is not necessary to enter the current time. Just enter the time and date to calculate the time difference from the current time.

You can easily do this calculation.

time calculation
・How long does it take from now until 3:45?
・How long has it been since then?
・What is the time 40 minutes from now?

date calculation
・What is the date 40 days from today?
How many days after your birthday?

It is a convenient calculator app that calculates the time difference by entering the date and time. This app accurately calculates the time difference from the current time by specifying the time and date by the user.