java - How to subtract System.currentTimeMillis() from Hours+Minutes taken from timepicker? -

i want subtract system.currenttimemillis() hours + minutes taken timepicker. however, system.currenttimemillis() larger compared hours + minutes converted milliseconds.

this code:

// setting time in milliseconds. hour1 , minute1 taken timepicker. app.settimemillisdosagetime(timeunit.hours.tomillis(hour1) + timeunit.minutes.tomillis(minute1)); 

i have timertask subtracting system.currenttimemillis.

timertask task = new timertask() {     timeinmillis = app.gettimemillisdosagetime();     timertask task = new timertask()     {         @override         public void run()         {            long ellapsedmillis = timeinmillis - system.currenttimemillis();         }         timer = new timer(false);         timer.schedule(task,0,1000);     } } 

but elapsedmillis negative. solution?

timeunit.hours.tomillis   // given number converted milliseconds. if give 1 input 60*60*1000 output. timeunit.hours.tomillis(1) = 60* 60 * 1000 timeunit.minutes.tomillis(1) = 60  * 1000   system.currenttimemillis() //milli seconds elapsed january 1, 1970 utc(coordinated universal time) 

but require these hour , minutes set current date, counting how many seconds elapsed 1970.

calendar chosentime = calendar.getinstance(); chosentime.set(calendar.hour_of_day, selectedhour); chosentime.set(calendar.minute, selectedminute);  chosentime.gettime().get(time)  // gives exact seconds can substracted system.currenttimemillis.