System.currentTimeMillis() giving wrong time in hours

Question

I'm trying to get my app to display a time, and for that I need to get the android's minutes and hours. I'm trying to use currentTimeMillis(), but I'm getting the wrong number for the hours. Here's my code for the hours and minutes using the systems clock.

    int defday = (int) (System.currentTimeMillis() / (1000 * 60 * 60 * 24));
    int defhour = (int) (System.currentTimeMillis() - (defday * 1000 * 60 * 60 * 24))
            / (1000 * 60 * 60);
    int defmin = (int) (System.currentTimeMillis()
            - (defhour * 1000 * 60 * 60) - (defday * 1000 * 60 * 60 * 24))
            / (1000 * 60);

After I run the app, the time shows the time as 5:36 even though the current time is 1:36. What am I doing wrong?

+1, it doesn't look like you're doing anything to handle which timezone you're in. If only the hours are off, this seems to be the cause. — Veselin Romić, Jul 22 '14 at 17:50

score 3 · Accepted Answer · edited Jun 20 '20 at 09:12

Create a Calendar object:

long millis=System.currentTimeMillis();
Calendar c=Calendar.getInstance();
c.setTimeInMillis(millis);

After this you can get the fields from the Calendar object:

int hours=c.get(Calendar.HOUR);
int minutes=c.get(Calendar.MINUTE);

Then:

int MinutesHours=(hours*60)+minutes; To go back, you can use the set method in Calendar:

Calendar c=Calendar.getInstance();
c.set(Calendar.MINUTE,minutes);
long millis=c.getTimeInMillis();

References

How to measure the a time-span in seconds using System.currentTimeMillis()?

currentTimeMillis() to Years, days, and minutes, and backwords. (hard)

Awesome, this works perfectly with what I'm trying to do – Bonhomme Jul 22 '14 at 18:04 — Bonhomme, Jul 22 '14 at 18:04

System.currentTimeMillis() giving wrong time in hours

1 Answers1