We have this program at my job that uses a language similar to JavaScript. Someone has set up a form that tracks the time people work on different projects. This person decided to make this field a character field. Now they want to add up all the time that was worked on for this project. Since they are char fields I told them it wasn't possible.

Is there a way to convert the char's into numbers and add the time?
They are setup in multiples of 15 like this
0:30
0:15
3:45
1:00 (60 minutes or 1 hour)
2:15