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javadatetimedate-comparison

I want to get day either is today or yesterday on the basis of miliseconds time i get

I have to return the string today and yesterday. The milliseconds I got from a function, so what have I got to do? I tried a lot.

    if((data.getStartTimeMilli()-86400000) < data.getStartTimeMilli())
    {
        return "Today";
    }
    else 
    {
        return "Yesterday";
    }

But it will return only today. Two millisecond values I pass in function, one is startdatemili and enddatemili. It’s a range of dates.

Solution

  • As menthioned in the comment, usually today does not mean 24 hours ago.

    Suppose now is 2018-10-06 15:20, 2018-10-06 00:01 should be considered as today, while 2018-10-05 23:59 is yesterday, though thay are both within 24 hours.

    This solution works on above assumption.

    Get the start millis of today:

    ZonedDateTime zonedDateTime = ZonedDateTime.now();
zonedDateTime = zonedDateTime.truncatedTo(ChronoUnit.DAYS);

long millis = zonedDateTime.toInstant().toEpochMilli();

    then compare with it:

    if((data.getStartTimeMilli() > millis) {
    return "Today";
} else
    return "Yesterday";
}

    But be careful, when the start milli is before today, does not mean it is yesterday, it might be some day earlier.

    If you do want to use 24 hours to limit today:

    Instant instant = Instant.now().minusMillis(86400000);
long millis = instant.toEpochMilli();