How do I add time to a timestamp?

问题:

I need to add 14 minutes and 59 seconds to an unknown time in an array. How do I do this? This is what I have so far:

Date duration = df.parse("0000-00-00 00:14:59");

arrayOpportunity[2] = arrayOpportunity[2] + duration;

The time is not being changed. Thanks!

I have done my research. I cant paste the entire code I have. But mainly I didnt want to make you read it all. Just looking for a simple answer of how to add two timestamps.

回答1:

If you are talking about a java.sql.Timestamp, it has a method called setTime. java.util.Date has a setTime method as well for that sort of thing.

You could something like this:

static final Long duration = ((14 * 60) + 59) * 1000;

oldTimestamp.setTime(oldTimestamp.getTime() + duration);

回答2:

Just add the appropriate number of milliseconds using #getTime() and #setTime():

timeStamp.setTime(timeStamp.getTime() + (((14 * 60) + 59)* 1000));

回答3:

If you want to add time in millis then you can just add

  (((14 * 60) + 59) * 1000) <-- Mili second value of 14 m and 59 sec

回答4:

arrayOpportunity[2] = arrayOpportunity[2] + 14*60*1000 + 59*1000;

The Date object you have may work, but it doesn't really represent 14 minutes and 59 seconds, it just represents a particular time in calendar (eg. 14 minutes 59 after the epoch start which is 1st January 1970 00:14:59).

回答5:

If you just want to add times, I suggest using Joda Time.

The class LocalTime lets you add durations like this:

LocalTime timeSum = time.plusMinutes(14).plusSeconds(59);