Question

How do I get the UTC milliseconds for today at a given time, say 6:15PM?

I want that as a start time then I will use the GPS getTime() function and be able to compute how much time until my start as the race committee always uses GPS time.

Looking at this documentation Calendar, I would think I would just need to call Calendar(); then get(MONTH), get(YEAR), etc and do a set(year, month, day, 18, 15,0); but that doesn’t work.

Maybe it is Calendar.YEAR, etc but I have not figured out the set equivalent and I get warnings.

I would appreciate some help.

Answer 1

// get calendar instance, substitute timezone for which ever you need or leave blank to use current
Calendar updateTime = Calendar.getInstance(TimeZone.getTimeZone("US/Pacific"));

updateTime.set(Calendar.HOUR_OF_DAY, 18); // set hour
updateTime.set(Calendar.MINUTE, 15);      // set minute
updateTime.set(Calendar.SECOND, 0);       // set seconds

long time = updateTime.getTimeInMillis(); // get milliseconds