Java get the number of seconds between 2 dates [duplicate]

Question

I'm trting to send data every 10 seconds , so I'm trying tp use this code I wrote but I think I made a mistake in the converting to seconds?

Calendar Time= Calendar.getInstance(); Calendar SendDate= Calendar.getInstance(); long upload = TimeBetweenDates(SendTime,Time); if (upload > 10000) { String udp = "OK"; SendUDP(udp); SendTime = Calendar.getInstance(); } public static long TimeBetweenDates (Calendar Start , Calendar End) { long end = End.getTimeInMillis(); long start = Start.getTimeInMillis(); return TimeUnit.MILLISECONDS.toSeconds(Math.abs(end - start)); }

What dates are you putting in? What number did you get? What number did you expect? — khelwood
– khelwood, Commented May 24, 2018 at 14:36
Why aren't you just use a ScheduledExecutor for sending so you don't have to calculate a difference at all? — daniu
– daniu, Commented May 24, 2018 at 14:37
Your TimeBetweenDates method seems like it should be correct except that in Java method and variable names begin with a lowercase letter. I find it confusing that you have parameters Start and End and variables start and end. In what way does your observed behaviour differ from the desired? — Anonymous
– Anonymous, Commented May 24, 2018 at 14:54

daniu · Accepted Answer · 2018-05-24 14:40:45Z

4

If you're "trying to send data every 10 seconds", you can just do

ScheduledExecutorService service = Executors.newScheduledThreadPool(); service.scheduleAtFixedRate(() -> sendUdp("OK"), 10, 10, TimeUnit.SECONDS);

answered May 24, 2018 at 14:40

daniu

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2 Comments

Korenron Over a year ago

this is not good for my beacue I need to make an IF with the send . if time is more then 10 or the data is not the same - the send.

daniu Over a year ago

@Korenron I did mean for you to adjust the submitted task, you can easily add the check you want.

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