[JBoss JIRA] Created: (JBPM-1137) Leap Year Date Calculations
by Alejandro Guizar (JIRA)
Leap Year Date Calculations
---------------------------
Key: JBPM-1137
URL: http://jira.jboss.com/jira/browse/JBPM-1137
Project: JBoss jBPM
Issue Type: Support Patch
Components: Core Engine
Affects Versions: jBPM jPDL 3.2.2
Reporter: Alejandro Guizar
Assigned To: Tom Baeyens
Based on JBPM-1098 there is concern over date calculations in in jBPM 3.1 and 3.2. There might be issues around the end of Feb.
Durations that are not expressed in months or years work correctly under the current model. Consider the following expression.
endDate = new Date(startDate.getTime() + interval);
If startDate is February 28, 2008 and interval is 1 day, then endDate will be February 29, 2008. Every day has the same duration even on leap years.
The presentation layer is responsible of converting the milliseconds in a Date to a suitable representation in the calendar system. The Java APIs are all aware of leap years, so this is covered as well.
The situation is different for months and years. If the interval above was 1 year, then endDate would be February 27, 2009. Because of the extra day in 2008, the expected endDate has shifted backwards one day.
To fix this, our Duration class has to preserve the original unit of time instead of converting to milliseconds up front. Then we can do the following.
startCalendar = Calendar.getInstance();
startCalendar.setTime(startDate);
startCalendar.add(unit, interval);
endDate = startCalendar.getTime();
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16 years, 9 months
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[JBoss JIRA] Created: (JBPM-1146) Leap Year Date Calculations (v3.1.4)
by Alejandro Guizar (JIRA)
Leap Year Date Calculations (v3.1.4)
------------------------------------
Key: JBPM-1146
URL: http://jira.jboss.com/jira/browse/JBPM-1146
Project: JBoss jBPM
Issue Type: Support Patch
Components: Core Engine
Affects Versions: jBPM 3.1.4
Reporter: Alejandro Guizar
Assigned To: Alejandro Guizar
Based on JBPM-1098 there is concern over date calculations in in jBPM 3.1 and 3.2. There might be issues around the end of Feb. The problem is characterized as follows. Under the current model, durations that are not expressed in months or years work correctly. Consider the following expression.
endDate = new Date(startDate.getTime() + interval);
If startDate is February 28, 2008 and interval is 1 day, then endDate will be February 29, 2008. Every day has the same duration even on leap years. The presentation layer is responsible of converting the milliseconds in a Date to a suitable representation in the calendar system. The Java APIs are all aware of leap years, so this is covered as well.
The situation is different for months and years. If the interval above was 1 year, then endDate would be February 27, 2009. Because of the extra day in 2008, the expected endDate has shifted backwards one day. To fix this, the Duration class has to preserve the original unit of time instead of converting to milliseconds up front. Calculation of endDate can then be delegated to java.util.Calendar as follows.
startCalendar = Calendar.getInstance();
startCalendar.setTime(startDate);
startCalendar.add(unit, interval);
endDate = startCalendar.getTime();
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16 years, 9 months
- 7
- 21