How can I find the amount of seconds passed from the midnight with Java?

Question

I need a function that gives me how many seconds passed from the midnight. I am currently using System.currentTimeMillis() but it gives me the UNIX like timestamp.

It would be a bonus for me if I could get the milliseconds too.

Answer 1

If you're using Java >= 8, this is easily done :

ZonedDateTime nowZoned = ZonedDateTime.now(); Instant midnight = nowZoned.toLocalDate().atStartOfDay(nowZoned.getZone()).toInstant(); Duration duration = Duration.between(midnight, Instant.now()); long seconds = duration.getSeconds(); 

If you're using Java 7 or less, you have to get the date from midnight via Calendar, and then substract.

Calendar c = Calendar.getInstance(); long now = c.getTimeInMillis(); c.set(Calendar.HOUR_OF_DAY, 0); c.set(Calendar.MINUTE, 0); c.set(Calendar.SECOND, 0); c.set(Calendar.MILLISECOND, 0); long passed = now - c.getTimeInMillis(); long secondsPassed = passed / 1000; 

Answer 2

java.time

Using the java.time framework built into Java 8 and later. See Tutorial.

import java.time.LocalTime import java.time.ZoneId  LocalTime now = LocalTime.now(ZoneId.systemDefault()) // LocalTime = 14:42:43.062 now.toSecondOfDay() // Int = 52963 

It is good practice to explicit specify ZoneId, even if you want default one.