How to calculate Time ago in in java(jsp)

Question

friends im new using date and time in java. I stored date and time in String which is the current time similarly I have one more string variable which has the post time now I want to calculate the ago time even in seconds on any the string has date and time in this format yyyy/MM/dd HH:mm:ss can some one help me Thank you here is the code

DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy/MM/dd HH:mm:ss");

        LocalDateTime currentTime = LocalDateTime.parse(d_tt, formatter);
        LocalDateTime postTime = LocalDateTime.parse(post_time, formatter);

        long seconds = ChronoUnit.SECONDS.between(postTime, currentTime);//(error here)

error "ChronoUnit cannot be resolved"

Does this answer your question? [Do we have a TimeSpan sort of class in Java](https://stackoverflow.com/questions/6581605/do-we-have-a-timespan-sort-of-class-in-java) — Clijsters, Jul 06 '20 at 12:34
Does this answer your question? [How to calculate time difference in java?](https://stackoverflow.com/questions/4927856/how-to-calculate-time-difference-in-java) — Paul, Jul 06 '20 at 12:42

tgallei · Accepted Answer · 2020-07-06T12:47:18.087

1

For this case it is best to use LocalDateTime.

First you have to convert the two strings into a LocalDateTime

DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy/MM/dd HH:mm:ss");

LocalDateTime currentTime = LocalDateTime.parse(currentTimeString, formatter); // Or use LocalDateTime.now()
LocalDateTime postTime = LocalDateTime.parse(postTimeString, formatter);

These objects can then be used to determine the time between them. There are two possibilities to do this. All of them give the same result, which you can use to determine the time between them according to your own preferences.

Possibility 1:

long seconds = postTime.until(currentTime, ChronoUnit.SECONDS);

Possibility 1:

long seconds = ChronoUnit.SECONDS.between(postTime, currentTime);

You can also get more information here:

edited Jul 06 '20 at 12:47

answered Jul 06 '20 at 12:35

tgallei

827
3
13
22

I tried this but im getting an error at ChronoUnit "ChronoUnit cannot be resolved to a variable" i did import java.time and I'm using java 11 – Education 4Fun Jul 06 '20 at 12:43
@Education4Fun Could you please attach your code to the question, so it is easier to answer your question – tgallei Jul 06 '20 at 12:49
long seconds = postTime.until(currentTime, ChronoUnit.SECONDS); or long seconds = ChronoUnit.SECONDS.between(postTime, currentTime); same error – Education 4Fun Jul 06 '20 at 12:50
Are you _importing_ `ChronoUnit`? `import java.time.temporal.ChronoUnit;`. – BeUndead Jul 06 '20 at 12:52
errors are resolved but the output is 0. will try to resolve them thanks for the help. – Education 4Fun Jul 06 '20 at 12:55

How to calculate Time ago in in java(jsp)

1 Answers1