java calculate time between two timestamps

问题

I need to calculate the time passed between two dates.

The catch here is that I need to show it as YouTube does with its video comments timestamps. That is, to show it by just the largest measure.

For example,

• if the time is 50 seconds ago it should say 50 seconds ago.
• if the time is more than one minute it should say one minute ago/ten minutes ago etc..
• if the time difference is 1 hour 30 mins it should show: an hour ago.
• if the time is one and a half week than it should say one week ago.
• if the time is more than a month it should say one month ago/two months ago etc...
• and so on and so on..

So what is the best way to handle this? Should I make a method with case or if statements that would return something like this? Or is there a better approach (maybe a library which already does something like it)?

回答1:

Use DateUtils.getRelativeTimeSpanString(long time, long now, long minResolution). time is the start time, and now is the end time (in milliseconds). To report "seconds ago," set minResolution to zero.

Example:

String result = DateUtils.getRelativeTimeSpanString(1306767830, 1306767835, 0);
// result = "5 seconds ago"

回答2:

 date1.getTime() - date2.getTime() 

This will return you the time in miliseconds between the 2 dates. Just convert that to what ever you want to show (e.g. hours minutes seconds)

回答3:

On Android, use this: http://developer.android.com/reference/android/text/format/DateUtils.html#getRelativeTimeSpanString%28android.content.Context,%20long,%20boolean%29

回答4:

Take a look at PrettyTime!

Also, everytime you want to do something date/time-related in Java, you should take a look at Joda Time. Do it now, you will thank me later.

回答5:

Your need is very specific, and I don't know any lib that would solve the problem for you out of the box. However the problem is not very complex and a small function full of "ifs" should do the trick. Of course, a nice date library like Joda Time will help you keep your code clean. Who wants to use GregorianCalendar!?

回答6:

Looks like you have a set of custom rules and the algorithm to choose a rule is based on the time in seconds between two timestamps. The easiest approach is to handle the rules in a series of if/else if statements:

 private String getTimeAsString(int seconds) {
   if (seconds < 60) {     // rule 1
      return String.format("%s seconds ago", seconds);
   } else if (seconds < 3600) {  // rule 2
      return String.format("%s minutes ago", seconds/60);
   } // ... and so on
 }

来源：https://stackoverflow.com/questions/6177830/java-calculate-time-between-two-timestamps