Difference between adding Duration.ofDays(1) and Period.ofDays(1) to ZonedDateTime around Daylight Savings...
The Daylight Savings Time ends on Nov 1 at 2 AM in US/Eastern time zone. As a result, 2 AM becomes 1 AM.
I am not able to understand the following in the code given below:
- Why line 2 shows time 09:00, why not 10:00 (by adding 1 day)?
Why line 4 shows time 10:00, why not 09:00 (by adding 24 hours)?
LocalDateTime ld = LocalDateTime.of(2015, Month.OCTOBER, 31, 10, 0);
ZonedDateTime date = ZonedDateTime.of(ld, ZoneId.of("US/Eastern"));
System.out.println(date); //line 1 - 2015-10-31T10:00-04:00[US/Eastern]
date = date.plus(Duration.ofDays(1));
System.out.println(date); //line 2 - 2015-11-01T09:00-05:00[US/Eastern]
date = ZonedDateTime.of(ld, ZoneId.of("US/Eastern"));
System.out.println(date); //line 3 - 2015-10-31T10:00-04:00[US/Eastern]
date = date.plus(Period.ofDays(1));
System.out.println(date); //line 4 - 2015-11-01T10:00-05:00[US/Eastern]
Could somebody please help me with it?
java datetime java-8 dst zoneddatetime
edited Nov 14 '18 at 4:20
Ole V.V.
27.7k63252
asked Nov 13 '18 at 18:52
skipskip
4,8992087137
add a comment |
The Daylight Savings Time ends on Nov 1 at 2 AM in US/Eastern time zone. As a result, 2 AM becomes 1 AM.
I am not able to understand the following in the code given below:
- Why line 2 shows time 09:00, why not 10:00 (by adding 1 day)?
Why line 4 shows time 10:00, why not 09:00 (by adding 24 hours)?
LocalDateTime ld = LocalDateTime.of(2015, Month.OCTOBER, 31, 10, 0);
ZonedDateTime date = ZonedDateTime.of(ld, ZoneId.of("US/Eastern"));
System.out.println(date); //line 1 - 2015-10-31T10:00-04:00[US/Eastern]
date = date.plus(Duration.ofDays(1));
System.out.println(date); //line 2 - 2015-11-01T09:00-05:00[US/Eastern]
date = ZonedDateTime.of(ld, ZoneId.of("US/Eastern"));
System.out.println(date); //line 3 - 2015-10-31T10:00-04:00[US/Eastern]
date = date.plus(Period.ofDays(1));
System.out.println(date); //line 4 - 2015-11-01T10:00-05:00[US/Eastern]
Could somebody please help me with it?
java datetime java-8 dst zoneddatetime
edited Nov 14 '18 at 4:20
Ole V.V.
27.7k63252
asked Nov 13 '18 at 18:52
skipskip
4,8992087137
1 day and 24 hours are two different things.
– Basil Bourque
Nov 14 '18 at 21:16
add a comment |
The Daylight Savings Time ends on Nov 1 at 2 AM in US/Eastern time zone. As a result, 2 AM becomes 1 AM.
I am not able to understand the following in the code given below:
- Why line 2 shows time 09:00, why not 10:00 (by adding 1 day)?
Why line 4 shows time 10:00, why not 09:00 (by adding 24 hours)?
LocalDateTime ld = LocalDateTime.of(2015, Month.OCTOBER, 31, 10, 0);
ZonedDateTime date = ZonedDateTime.of(ld, ZoneId.of("US/Eastern"));
System.out.println(date); //line 1 - 2015-10-31T10:00-04:00[US/Eastern]
date = date.plus(Duration.ofDays(1));
System.out.println(date); //line 2 - 2015-11-01T09:00-05:00[US/Eastern]
date = ZonedDateTime.of(ld, ZoneId.of("US/Eastern"));
System.out.println(date); //line 3 - 2015-10-31T10:00-04:00[US/Eastern]
date = date.plus(Period.ofDays(1));
System.out.println(date); //line 4 - 2015-11-01T10:00-05:00[US/Eastern]
Could somebody please help me with it?
java datetime java-8 dst zoneddatetime
edited Nov 14 '18 at 4:20
Ole V.V.
27.7k63252
asked Nov 13 '18 at 18:52
skipskip
4,8992087137
The Daylight Savings Time ends on Nov 1 at 2 AM in US/Eastern time zone. As a result, 2 AM becomes 1 AM.
I am not able to understand the following in the code given below:
- Why line 2 shows time 09:00, why not 10:00 (by adding 1 day)?
Why line 4 shows time 10:00, why not 09:00 (by adding 24 hours)?
LocalDateTime ld = LocalDateTime.of(2015, Month.OCTOBER, 31, 10, 0);
ZonedDateTime date = ZonedDateTime.of(ld, ZoneId.of("US/Eastern"));
System.out.println(date); //line 1 - 2015-10-31T10:00-04:00[US/Eastern]
date = date.plus(Duration.ofDays(1));
System.out.println(date); //line 2 - 2015-11-01T09:00-05:00[US/Eastern]
date = ZonedDateTime.of(ld, ZoneId.of("US/Eastern"));
System.out.println(date); //line 3 - 2015-10-31T10:00-04:00[US/Eastern]
date = date.plus(Period.ofDays(1));
System.out.println(date); //line 4 - 2015-11-01T10:00-05:00[US/Eastern]
Could somebody please help me with it?
java datetime java-8 dst zoneddatetime
java datetime java-8 dst zoneddatetime
edited Nov 14 '18 at 4:20
Ole V.V.
27.7k63252
asked Nov 13 '18 at 18:52
skipskip
4,8992087137
edited Nov 14 '18 at 4:20
Ole V.V.
27.7k63252
asked Nov 13 '18 at 18:52
skipskip
4,8992087137
edited Nov 14 '18 at 4:20
Ole V.V.
27.7k63252
edited Nov 14 '18 at 4:20
Ole V.V.
27.7k63252
edited Nov 14 '18 at 4:20
Ole V.V.
27.7k63252
27.7k63252
asked Nov 13 '18 at 18:52
skipskip
4,8992087137
asked Nov 13 '18 at 18:52
skipskip
4,8992087137
asked Nov 13 '18 at 18:52
skipskip
4,8992087137
4,8992087137
1 day and 24 hours are two different things.
– Basil Bourque
Nov 14 '18 at 21:16
add a comment |
1 day and 24 hours are two different things.
– Basil Bourque
Nov 14 '18 at 21:16
1 day and 24 hours are two different things.
– Basil Bourque
Nov 14 '18 at 21:16
1 day and 24 hours are two different things.
– Basil Bourque
Nov 14 '18 at 21:16
add a comment |
2 Answers
2
active
oldest
votes
Duration: Despite the ofDays method Duration hasn’t got a notion of days. Duration.ofDays(1) is immediately converted into 24 hours, so this is what you are adding. Since you add 24 hours to 10:00 the day before DST ends, you get 09:00 the next day as you have observed,
Period: Contrary to Duration a Period knows days, weeks, months and years. So you are adding 1 calendar day, hitting the same wall clock time on the next day (10:00) even though this means 25 hours later (not 24).
answered Nov 14 '18 at 4:37
Ole V.V.Ole V.V.
27.7k63252
If duration adds 24 hours, should it not give 09:00 next day (considering DST)? Similarly, should adding a day (for period of 1 day) give us 10:00 next day? What I am getting in the answer is other way round.Duration.ofDays(1)is giving 10:00, whilePeriod.ofDays(1)is giving 09:00.
– skip
Nov 14 '18 at 7:03
2
Aren’t you confusing yourself now? If duration adds 24 hours, should it not give 09:00 next day (considering DST)? Yes, and this is also what you report in the question that you get. Similarly, should adding a day (for period of 1 day) give us 10:00 next day? Yes, and your question states that this is exactly what you got.
– Ole V.V.
Nov 14 '18 at 7:09
You're correct. It looks like I've been seeing and readingPeriod.ofDays(1)asDuration.ofDays(1)andDuration.ofDays(1)asPeriod.ofDays(1). Even in my question I did the same. I thoughtline 2was forPeriodandline 4forDuration. Thanks.
– skip
Nov 14 '18 at 7:29
add a comment |
See the full Java documentation on Duration and Period, always one quick Google search away.
From Duration:
In addition, the DAYS unit can be used and is treated as exactly equal
to 24 hours, thus ignoring daylight savings effects. See Period for
the date-based equivalent to this class.
From Period:
Durations and periods differ in their treatment of daylight savings
time when added to ZonedDateTime. A Duration will add an exact number
of seconds, thus a duration of one day is always exactly 24 hours. By
contrast, a Period will add a conceptual day, trying to maintain the
local time
So, Period will maintain the same hour, whereas Duration will add 24 hours.
24 hours after 10:00 on October 31 is 9:00 on November 1st.
- 11:00
- 12:00
- 13:00 (1 pm)
- 14:00
- 15:00
- 16:00
- 17:00
- 18:00
- 19:00
- 20:00
- 21:00
- 22:00
- 23:00
- 0:00 (midnight)
- 1:00
- 1:00 (here's that extra hour)
- 2:00
- 3:00
- 4:00
- 5:00
- 6:00
- 7:00
- 8:00
- 9:00
answered Nov 13 '18 at 20:24
Wonko the SaneWonko the Sane
8,69964878
1
Here too you’ve been confused, @skip. :-) The answer is correct.
– Ole V.V.
Nov 14 '18 at 7:39
add a comment |
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2 Answers
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2 Answers
2
active
oldest
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oldest
votes
Duration: Despite the ofDays method Duration hasn’t got a notion of days. Duration.ofDays(1) is immediately converted into 24 hours, so this is what you are adding. Since you add 24 hours to 10:00 the day before DST ends, you get 09:00 the next day as you have observed,
Period: Contrary to Duration a Period knows days, weeks, months and years. So you are adding 1 calendar day, hitting the same wall clock time on the next day (10:00) even though this means 25 hours later (not 24).
answered Nov 14 '18 at 4:37
Ole V.V.Ole V.V.
27.7k63252
If duration adds 24 hours, should it not give 09:00 next day (considering DST)? Similarly, should adding a day (for period of 1 day) give us 10:00 next day? What I am getting in the answer is other way round.Duration.ofDays(1)is giving 10:00, whilePeriod.ofDays(1)is giving 09:00.
– skip
Nov 14 '18 at 7:03
2
Aren’t you confusing yourself now? If duration adds 24 hours, should it not give 09:00 next day (considering DST)? Yes, and this is also what you report in the question that you get. Similarly, should adding a day (for period of 1 day) give us 10:00 next day? Yes, and your question states that this is exactly what you got.
– Ole V.V.
Nov 14 '18 at 7:09
You're correct. It looks like I've been seeing and readingPeriod.ofDays(1)asDuration.ofDays(1)andDuration.ofDays(1)asPeriod.ofDays(1). Even in my question I did the same. I thoughtline 2was forPeriodandline 4forDuration. Thanks.
– skip
Nov 14 '18 at 7:29
add a comment |
Duration: Despite the ofDays method Duration hasn’t got a notion of days. Duration.ofDays(1) is immediately converted into 24 hours, so this is what you are adding. Since you add 24 hours to 10:00 the day before DST ends, you get 09:00 the next day as you have observed,
Period: Contrary to Duration a Period knows days, weeks, months and years. So you are adding 1 calendar day, hitting the same wall clock time on the next day (10:00) even though this means 25 hours later (not 24).
answered Nov 14 '18 at 4:37
Ole V.V.Ole V.V.
27.7k63252
If duration adds 24 hours, should it not give 09:00 next day (considering DST)? Similarly, should adding a day (for period of 1 day) give us 10:00 next day? What I am getting in the answer is other way round.Duration.ofDays(1)is giving 10:00, whilePeriod.ofDays(1)is giving 09:00.
– skip
Nov 14 '18 at 7:03
2
Aren’t you confusing yourself now? If duration adds 24 hours, should it not give 09:00 next day (considering DST)? Yes, and this is also what you report in the question that you get. Similarly, should adding a day (for period of 1 day) give us 10:00 next day? Yes, and your question states that this is exactly what you got.
– Ole V.V.
Nov 14 '18 at 7:09
You're correct. It looks like I've been seeing and readingPeriod.ofDays(1)asDuration.ofDays(1)andDuration.ofDays(1)asPeriod.ofDays(1). Even in my question I did the same. I thoughtline 2was forPeriodandline 4forDuration. Thanks.
– skip
Nov 14 '18 at 7:29
add a comment |
Duration: Despite the ofDays method Duration hasn’t got a notion of days. Duration.ofDays(1) is immediately converted into 24 hours, so this is what you are adding. Since you add 24 hours to 10:00 the day before DST ends, you get 09:00 the next day as you have observed,
Period: Contrary to Duration a Period knows days, weeks, months and years. So you are adding 1 calendar day, hitting the same wall clock time on the next day (10:00) even though this means 25 hours later (not 24).
answered Nov 14 '18 at 4:37
Ole V.V.Ole V.V.
27.7k63252
Duration: Despite the ofDays method Duration hasn’t got a notion of days. Duration.ofDays(1) is immediately converted into 24 hours, so this is what you are adding. Since you add 24 hours to 10:00 the day before DST ends, you get 09:00 the next day as you have observed,
Period: Contrary to Duration a Period knows days, weeks, months and years. So you are adding 1 calendar day, hitting the same wall clock time on the next day (10:00) even though this means 25 hours later (not 24).
answered Nov 14 '18 at 4:37
Ole V.V.Ole V.V.
27.7k63252
edited Nov 14 '18 at 7:08
answered Nov 14 '18 at 4:37
Ole V.V.Ole V.V.
27.7k63252
answered Nov 14 '18 at 4:37
Ole V.V.Ole V.V.
27.7k63252
answered Nov 14 '18 at 4:37
Ole V.V.Ole V.V.
27.7k63252
27.7k63252
If duration adds 24 hours, should it not give 09:00 next day (considering DST)? Similarly, should adding a day (for period of 1 day) give us 10:00 next day? What I am getting in the answer is other way round.Duration.ofDays(1)is giving 10:00, whilePeriod.ofDays(1)is giving 09:00.
– skip
Nov 14 '18 at 7:03
2
Aren’t you confusing yourself now? If duration adds 24 hours, should it not give 09:00 next day (considering DST)? Yes, and this is also what you report in the question that you get. Similarly, should adding a day (for period of 1 day) give us 10:00 next day? Yes, and your question states that this is exactly what you got.
– Ole V.V.
Nov 14 '18 at 7:09
You're correct. It looks like I've been seeing and readingPeriod.ofDays(1)asDuration.ofDays(1)andDuration.ofDays(1)asPeriod.ofDays(1). Even in my question I did the same. I thoughtline 2was forPeriodandline 4forDuration. Thanks.
– skip
Nov 14 '18 at 7:29
add a comment |
If duration adds 24 hours, should it not give 09:00 next day (considering DST)? Similarly, should adding a day (for period of 1 day) give us 10:00 next day? What I am getting in the answer is other way round.Duration.ofDays(1)is giving 10:00, whilePeriod.ofDays(1)is giving 09:00.
– skip
Nov 14 '18 at 7:03
2
Aren’t you confusing yourself now? If duration adds 24 hours, should it not give 09:00 next day (considering DST)? Yes, and this is also what you report in the question that you get. Similarly, should adding a day (for period of 1 day) give us 10:00 next day? Yes, and your question states that this is exactly what you got.
– Ole V.V.
Nov 14 '18 at 7:09
You're correct. It looks like I've been seeing and readingPeriod.ofDays(1)asDuration.ofDays(1)andDuration.ofDays(1)asPeriod.ofDays(1). Even in my question I did the same. I thoughtline 2was forPeriodandline 4forDuration. Thanks.
– skip
Nov 14 '18 at 7:29
If duration adds 24 hours, should it not give 09:00 next day (considering DST)? Similarly, should adding a day (for period of 1 day) give us 10:00 next day? What I am getting in the answer is other way round.
Duration.ofDays(1) is giving 10:00, while Period.ofDays(1) is giving 09:00.– skip
Nov 14 '18 at 7:03
If duration adds 24 hours, should it not give 09:00 next day (considering DST)? Similarly, should adding a day (for period of 1 day) give us 10:00 next day? What I am getting in the answer is other way round.
Duration.ofDays(1) is giving 10:00, while Period.ofDays(1) is giving 09:00.– skip
Nov 14 '18 at 7:03
2
2
Aren’t you confusing yourself now? If duration adds 24 hours, should it not give 09:00 next day (considering DST)? Yes, and this is also what you report in the question that you get. Similarly, should adding a day (for period of 1 day) give us 10:00 next day? Yes, and your question states that this is exactly what you got.
– Ole V.V.
Nov 14 '18 at 7:09
Aren’t you confusing yourself now? If duration adds 24 hours, should it not give 09:00 next day (considering DST)? Yes, and this is also what you report in the question that you get. Similarly, should adding a day (for period of 1 day) give us 10:00 next day? Yes, and your question states that this is exactly what you got.
– Ole V.V.
Nov 14 '18 at 7:09
You're correct. It looks like I've been seeing and reading
Period.ofDays(1) as Duration.ofDays(1) and Duration.ofDays(1) as Period.ofDays(1). Even in my question I did the same. I thought line 2 was for Period and line 4 for Duration. Thanks.– skip
Nov 14 '18 at 7:29
You're correct. It looks like I've been seeing and reading
Period.ofDays(1) as Duration.ofDays(1) and Duration.ofDays(1) as Period.ofDays(1). Even in my question I did the same. I thought line 2 was for Period and line 4 for Duration. Thanks.– skip
Nov 14 '18 at 7:29
add a comment |
See the full Java documentation on Duration and Period, always one quick Google search away.
From Duration:
In addition, the DAYS unit can be used and is treated as exactly equal
to 24 hours, thus ignoring daylight savings effects. See Period for
the date-based equivalent to this class.
From Period:
Durations and periods differ in their treatment of daylight savings
time when added to ZonedDateTime. A Duration will add an exact number
of seconds, thus a duration of one day is always exactly 24 hours. By
contrast, a Period will add a conceptual day, trying to maintain the
local time
So, Period will maintain the same hour, whereas Duration will add 24 hours.
24 hours after 10:00 on October 31 is 9:00 on November 1st.
- 11:00
- 12:00
- 13:00 (1 pm)
- 14:00
- 15:00
- 16:00
- 17:00
- 18:00
- 19:00
- 20:00
- 21:00
- 22:00
- 23:00
- 0:00 (midnight)
- 1:00
- 1:00 (here's that extra hour)
- 2:00
- 3:00
- 4:00
- 5:00
- 6:00
- 7:00
- 8:00
- 9:00
answered Nov 13 '18 at 20:24
Wonko the SaneWonko the Sane
8,69964878
1
Here too you’ve been confused, @skip. :-) The answer is correct.
– Ole V.V.
Nov 14 '18 at 7:39
add a comment |
See the full Java documentation on Duration and Period, always one quick Google search away.
From Duration:
In addition, the DAYS unit can be used and is treated as exactly equal
to 24 hours, thus ignoring daylight savings effects. See Period for
the date-based equivalent to this class.
From Period:
Durations and periods differ in their treatment of daylight savings
time when added to ZonedDateTime. A Duration will add an exact number
of seconds, thus a duration of one day is always exactly 24 hours. By
contrast, a Period will add a conceptual day, trying to maintain the
local time
So, Period will maintain the same hour, whereas Duration will add 24 hours.
24 hours after 10:00 on October 31 is 9:00 on November 1st.
- 11:00
- 12:00
- 13:00 (1 pm)
- 14:00
- 15:00
- 16:00
- 17:00
- 18:00
- 19:00
- 20:00
- 21:00
- 22:00
- 23:00
- 0:00 (midnight)
- 1:00
- 1:00 (here's that extra hour)
- 2:00
- 3:00
- 4:00
- 5:00
- 6:00
- 7:00
- 8:00
- 9:00
answered Nov 13 '18 at 20:24
Wonko the SaneWonko the Sane
8,69964878
1
Here too you’ve been confused, @skip. :-) The answer is correct.
– Ole V.V.
Nov 14 '18 at 7:39
add a comment |
See the full Java documentation on Duration and Period, always one quick Google search away.
From Duration:
In addition, the DAYS unit can be used and is treated as exactly equal
to 24 hours, thus ignoring daylight savings effects. See Period for
the date-based equivalent to this class.
From Period:
Durations and periods differ in their treatment of daylight savings
time when added to ZonedDateTime. A Duration will add an exact number
of seconds, thus a duration of one day is always exactly 24 hours. By
contrast, a Period will add a conceptual day, trying to maintain the
local time
So, Period will maintain the same hour, whereas Duration will add 24 hours.
24 hours after 10:00 on October 31 is 9:00 on November 1st.
- 11:00
- 12:00
- 13:00 (1 pm)
- 14:00
- 15:00
- 16:00
- 17:00
- 18:00
- 19:00
- 20:00
- 21:00
- 22:00
- 23:00
- 0:00 (midnight)
- 1:00
- 1:00 (here's that extra hour)
- 2:00
- 3:00
- 4:00
- 5:00
- 6:00
- 7:00
- 8:00
- 9:00
answered Nov 13 '18 at 20:24
Wonko the SaneWonko the Sane
8,69964878
See the full Java documentation on Duration and Period, always one quick Google search away.
From Duration:
In addition, the DAYS unit can be used and is treated as exactly equal
to 24 hours, thus ignoring daylight savings effects. See Period for
the date-based equivalent to this class.
From Period:
Durations and periods differ in their treatment of daylight savings
time when added to ZonedDateTime. A Duration will add an exact number
of seconds, thus a duration of one day is always exactly 24 hours. By
contrast, a Period will add a conceptual day, trying to maintain the
local time
So, Period will maintain the same hour, whereas Duration will add 24 hours.
24 hours after 10:00 on October 31 is 9:00 on November 1st.
- 11:00
- 12:00
- 13:00 (1 pm)
- 14:00
- 15:00
- 16:00
- 17:00
- 18:00
- 19:00
- 20:00
- 21:00
- 22:00
- 23:00
- 0:00 (midnight)
- 1:00
- 1:00 (here's that extra hour)
- 2:00
- 3:00
- 4:00
- 5:00
- 6:00
- 7:00
- 8:00
- 9:00
answered Nov 13 '18 at 20:24
Wonko the SaneWonko the Sane
8,69964878
answered Nov 13 '18 at 20:24
Wonko the SaneWonko the Sane
8,69964878
answered Nov 13 '18 at 20:24
Wonko the SaneWonko the Sane
8,69964878
answered Nov 13 '18 at 20:24
Wonko the SaneWonko the Sane
8,69964878
8,69964878
1
Here too you’ve been confused, @skip. :-) The answer is correct.
– Ole V.V.
Nov 14 '18 at 7:39
add a comment |
1
Here too you’ve been confused, @skip. :-) The answer is correct.
– Ole V.V.
Nov 14 '18 at 7:39
1
1
Here too you’ve been confused, @skip. :-) The answer is correct.
– Ole V.V.
Nov 14 '18 at 7:39
Here too you’ve been confused, @skip. :-) The answer is correct.
– Ole V.V.
Nov 14 '18 at 7:39
add a comment |
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1 day and 24 hours are two different things.
– Basil Bourque
Nov 14 '18 at 21:16