Why is the difference between two dates returning one extra day?
I have the following Instant object
Instant instant = Instant.parse("2018-11-29T00:00:00.00Z");
verify(instant, 5);
And the date today is Nov 24, 2018. I want to write a method that verifies that the instant is 5 days from today. Here is the method:
public void verify(Instant instant, int offsetInDays)
{
LocalDateTime localDateTime = LocalDateTime.ofInstant(instant, ZoneOffset.UTC);
LocalDate endDate = LocalDate.from(localDateTime);
LocalDate now = LocalDate.now();
assertEquals(offsetInDays, ChronoUnit.DAYS.between(now, endDate));
}
It should assert that 5 is equal to 5, but ChronoUnit.DAYS.between(now, endDate) is returning 6 days. Why is there an extra day in the comparison? I'm unable to figure out how to do an accurate comparison.
java
asked Nov 25 '18 at 0:51
RonApple1996RonApple1996
877
add a comment |
I have the following Instant object
Instant instant = Instant.parse("2018-11-29T00:00:00.00Z");
verify(instant, 5);
And the date today is Nov 24, 2018. I want to write a method that verifies that the instant is 5 days from today. Here is the method:
public void verify(Instant instant, int offsetInDays)
{
LocalDateTime localDateTime = LocalDateTime.ofInstant(instant, ZoneOffset.UTC);
LocalDate endDate = LocalDate.from(localDateTime);
LocalDate now = LocalDate.now();
assertEquals(offsetInDays, ChronoUnit.DAYS.between(now, endDate));
}
It should assert that 5 is equal to 5, but ChronoUnit.DAYS.between(now, endDate) is returning 6 days. Why is there an extra day in the comparison? I'm unable to figure out how to do an accurate comparison.
java
asked Nov 25 '18 at 0:51
RonApple1996RonApple1996
877
LocalDate.now() is not in UTC time zone, hence the extra day...
– moilejter
Nov 25 '18 at 1:02
@moilejter I changed it to LocalDate.now(ZoneOffset.UTC) and it still returns 6 days
– RonApple1996
Nov 25 '18 at 1:05
1
Print out the two date values, converted to the same time zone, so you can see what it's comparing?
– moilejter
Nov 25 '18 at 1:10
Actually @moilejter you were right.. thanks for pointing that out. I ran the test sometime yesterday morning and it worked. But tonight it didnt because UTC time actually makes it Nov 30 1am instead of Nov 29 7pm. adding ZoneOffset.UTC did in fact fix it. Thanks again
– RonApple1996
Nov 25 '18 at 1:20
add a comment |
I have the following Instant object
Instant instant = Instant.parse("2018-11-29T00:00:00.00Z");
verify(instant, 5);
And the date today is Nov 24, 2018. I want to write a method that verifies that the instant is 5 days from today. Here is the method:
public void verify(Instant instant, int offsetInDays)
{
LocalDateTime localDateTime = LocalDateTime.ofInstant(instant, ZoneOffset.UTC);
LocalDate endDate = LocalDate.from(localDateTime);
LocalDate now = LocalDate.now();
assertEquals(offsetInDays, ChronoUnit.DAYS.between(now, endDate));
}
It should assert that 5 is equal to 5, but ChronoUnit.DAYS.between(now, endDate) is returning 6 days. Why is there an extra day in the comparison? I'm unable to figure out how to do an accurate comparison.
java
asked Nov 25 '18 at 0:51
RonApple1996RonApple1996
877
I have the following Instant object
Instant instant = Instant.parse("2018-11-29T00:00:00.00Z");
verify(instant, 5);
And the date today is Nov 24, 2018. I want to write a method that verifies that the instant is 5 days from today. Here is the method:
public void verify(Instant instant, int offsetInDays)
{
LocalDateTime localDateTime = LocalDateTime.ofInstant(instant, ZoneOffset.UTC);
LocalDate endDate = LocalDate.from(localDateTime);
LocalDate now = LocalDate.now();
assertEquals(offsetInDays, ChronoUnit.DAYS.between(now, endDate));
}
It should assert that 5 is equal to 5, but ChronoUnit.DAYS.between(now, endDate) is returning 6 days. Why is there an extra day in the comparison? I'm unable to figure out how to do an accurate comparison.
java
java
asked Nov 25 '18 at 0:51
RonApple1996RonApple1996
877
asked Nov 25 '18 at 0:51
RonApple1996RonApple1996
877
asked Nov 25 '18 at 0:51
RonApple1996RonApple1996
877
asked Nov 25 '18 at 0:51
RonApple1996RonApple1996
877
asked Nov 25 '18 at 0:51
RonApple1996RonApple1996
877
877
LocalDate.now() is not in UTC time zone, hence the extra day...
– moilejter
Nov 25 '18 at 1:02
@moilejter I changed it to LocalDate.now(ZoneOffset.UTC) and it still returns 6 days
– RonApple1996
Nov 25 '18 at 1:05
1
Print out the two date values, converted to the same time zone, so you can see what it's comparing?
– moilejter
Nov 25 '18 at 1:10
Actually @moilejter you were right.. thanks for pointing that out. I ran the test sometime yesterday morning and it worked. But tonight it didnt because UTC time actually makes it Nov 30 1am instead of Nov 29 7pm. adding ZoneOffset.UTC did in fact fix it. Thanks again
– RonApple1996
Nov 25 '18 at 1:20
add a comment |
LocalDate.now() is not in UTC time zone, hence the extra day...
– moilejter
Nov 25 '18 at 1:02
@moilejter I changed it to LocalDate.now(ZoneOffset.UTC) and it still returns 6 days
– RonApple1996
Nov 25 '18 at 1:05
1
Print out the two date values, converted to the same time zone, so you can see what it's comparing?
– moilejter
Nov 25 '18 at 1:10
Actually @moilejter you were right.. thanks for pointing that out. I ran the test sometime yesterday morning and it worked. But tonight it didnt because UTC time actually makes it Nov 30 1am instead of Nov 29 7pm. adding ZoneOffset.UTC did in fact fix it. Thanks again
– RonApple1996
Nov 25 '18 at 1:20
LocalDate.now() is not in UTC time zone, hence the extra day...
– moilejter
Nov 25 '18 at 1:02
LocalDate.now() is not in UTC time zone, hence the extra day...
– moilejter
Nov 25 '18 at 1:02
@moilejter I changed it to LocalDate.now(ZoneOffset.UTC) and it still returns 6 days
– RonApple1996
Nov 25 '18 at 1:05
@moilejter I changed it to LocalDate.now(ZoneOffset.UTC) and it still returns 6 days
– RonApple1996
Nov 25 '18 at 1:05
1
1
Print out the two date values, converted to the same time zone, so you can see what it's comparing?
– moilejter
Nov 25 '18 at 1:10
Print out the two date values, converted to the same time zone, so you can see what it's comparing?
– moilejter
Nov 25 '18 at 1:10
Actually @moilejter you were right.. thanks for pointing that out. I ran the test sometime yesterday morning and it worked. But tonight it didnt because UTC time actually makes it Nov 30 1am instead of Nov 29 7pm. adding ZoneOffset.UTC did in fact fix it. Thanks again
– RonApple1996
Nov 25 '18 at 1:20
Actually @moilejter you were right.. thanks for pointing that out. I ran the test sometime yesterday morning and it worked. But tonight it didnt because UTC time actually makes it Nov 30 1am instead of Nov 29 7pm. adding ZoneOffset.UTC did in fact fix it. Thanks again
– RonApple1996
Nov 25 '18 at 1:20
add a comment |
1 Answer
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votes
I think you're exposing some conversions that you aren't aware of, by forcing UTC in the first line of verify(), and then converting it to LocalDate. This works regardless of the time zones involved on my machine.
public void verify(Instant instant, int offsetInDays)
{
LocalDateTime localDateTime = LocalDateTime.ofInstant(instant, ZoneOffset.UTC);
LocalDateTime endDate = localDateTime.plusDays(offsetInDays);
assertEquals(offsetInDays, ChronoUnit.DAYS.between(localDateTime, endDate));
}
answered Nov 25 '18 at 1:11
gtcompscientistgtcompscientist
613516
add a comment |
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1 Answer
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1 Answer
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I think you're exposing some conversions that you aren't aware of, by forcing UTC in the first line of verify(), and then converting it to LocalDate. This works regardless of the time zones involved on my machine.
public void verify(Instant instant, int offsetInDays)
{
LocalDateTime localDateTime = LocalDateTime.ofInstant(instant, ZoneOffset.UTC);
LocalDateTime endDate = localDateTime.plusDays(offsetInDays);
assertEquals(offsetInDays, ChronoUnit.DAYS.between(localDateTime, endDate));
}
answered Nov 25 '18 at 1:11
gtcompscientistgtcompscientist
613516
add a comment |
I think you're exposing some conversions that you aren't aware of, by forcing UTC in the first line of verify(), and then converting it to LocalDate. This works regardless of the time zones involved on my machine.
public void verify(Instant instant, int offsetInDays)
{
LocalDateTime localDateTime = LocalDateTime.ofInstant(instant, ZoneOffset.UTC);
LocalDateTime endDate = localDateTime.plusDays(offsetInDays);
assertEquals(offsetInDays, ChronoUnit.DAYS.between(localDateTime, endDate));
}
answered Nov 25 '18 at 1:11
gtcompscientistgtcompscientist
613516
add a comment |
I think you're exposing some conversions that you aren't aware of, by forcing UTC in the first line of verify(), and then converting it to LocalDate. This works regardless of the time zones involved on my machine.
public void verify(Instant instant, int offsetInDays)
{
LocalDateTime localDateTime = LocalDateTime.ofInstant(instant, ZoneOffset.UTC);
LocalDateTime endDate = localDateTime.plusDays(offsetInDays);
assertEquals(offsetInDays, ChronoUnit.DAYS.between(localDateTime, endDate));
}
answered Nov 25 '18 at 1:11
gtcompscientistgtcompscientist
613516
I think you're exposing some conversions that you aren't aware of, by forcing UTC in the first line of verify(), and then converting it to LocalDate. This works regardless of the time zones involved on my machine.
public void verify(Instant instant, int offsetInDays)
{
LocalDateTime localDateTime = LocalDateTime.ofInstant(instant, ZoneOffset.UTC);
LocalDateTime endDate = localDateTime.plusDays(offsetInDays);
assertEquals(offsetInDays, ChronoUnit.DAYS.between(localDateTime, endDate));
}
answered Nov 25 '18 at 1:11
gtcompscientistgtcompscientist
613516
answered Nov 25 '18 at 1:11
gtcompscientistgtcompscientist
613516
answered Nov 25 '18 at 1:11
gtcompscientistgtcompscientist
613516
answered Nov 25 '18 at 1:11
gtcompscientistgtcompscientist
613516
613516
add a comment |
add a comment |
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LocalDate.now() is not in UTC time zone, hence the extra day...
– moilejter
Nov 25 '18 at 1:02
@moilejter I changed it to LocalDate.now(ZoneOffset.UTC) and it still returns 6 days
– RonApple1996
Nov 25 '18 at 1:05
1
Print out the two date values, converted to the same time zone, so you can see what it's comparing?
– moilejter
Nov 25 '18 at 1:10
Actually @moilejter you were right.. thanks for pointing that out. I ran the test sometime yesterday morning and it worked. But tonight it didnt because UTC time actually makes it Nov 30 1am instead of Nov 29 7pm. adding ZoneOffset.UTC did in fact fix it. Thanks again
– RonApple1996
Nov 25 '18 at 1:20