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fixes #471 (#481)

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Expand fix for ja era to handle months and days
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Eric Wong 2019-04-30 12:26:05 -07:00 • committed by GitHub
parent 94a90d772a
commit 32aaa0d7e1
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2 changed files with 105 additions and 57 deletions
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76
src/CalcViewModel/Common/DateCalculator.cpp
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@ -26,21 +26,19 @@ bool DateCalculationEngine::AddDuration(_In_ DateTime startDate, _In_ const Date
{
m_calendar->SetDateTime(startDate);
// The Japanese Era system can have multiple year partitions within the same year.
// For example, April 30, 2019 is denoted April 30, Heisei 31; May 1, 2019 is denoted as May 1, Reiwa 1.
// The Calendar treats Heisei 31 and Reiwa 1 as separate years, which results in some unexpected behaviors where subtracting a year from Reiwa 1 results in a date in Heisei 31.
// To provide the expected result across era boundaries, we first convert the Japanese era system to a Gregorian system, do date math, and then convert back to the Japanese era system.
// This works because the Japanese era system maintains the same year/month boundaries and durations as the Gregorian system and is only different in display value.
if (currentCalendarSystem == CalendarIdentifiers::Japanese)
{
m_calendar->ChangeCalendarSystem(CalendarIdentifiers::Gregorian);
}
if (duration.year != 0)
{
// The Japanese Era system can have multiple year partitions within the same year.
// For example, April 30, 2019 is denoted April 30, Heisei 31; May 1, 2019 is denoted as May 1, Reiwa 1.
// The Calendar treats Heisei 31 and Reiwa 1 as separate years, which results in some unexpected behaviors where subtracting a year from Reiwa 1 results in a date in Heisei 31.
// To provide the expected result across era boundaries, we first convert the Japanese era system to a Gregorian system, do date math, and then convert back to the Japanese era system.
// This works because the Japanese era system maintains the same year/month boundaries and durations as the Gregorian system and is only different in display value.
if (currentCalendarSystem == CalendarIdentifiers::Japanese)
{
m_calendar->ChangeCalendarSystem(CalendarIdentifiers::Gregorian);
}
m_calendar->AddYears(duration.year);
m_calendar->ChangeCalendarSystem(currentCalendarSystem);
}
if (duration.month != 0)
{
@ -62,6 +60,8 @@ bool DateCalculationEngine::AddDuration(_In_ DateTime startDate, _In_ const Date
return false;
}
m_calendar->ChangeCalendarSystem(currentCalendarSystem);
return true;
}
@ -77,6 +77,16 @@ bool DateCalculationEngine::SubtractDuration(_In_ DateTime startDate, _In_ const
{
m_calendar->SetDateTime(startDate);
// The Japanese Era system can have multiple year partitions within the same year.
// For example, April 30, 2019 is denoted April 30, Heisei 31; May 1, 2019 is denoted as May 1, Reiwa 1.
// The Calendar treats Heisei 31 and Reiwa 1 as separate years, which results in some unexpected behaviors where subtracting a year from Reiwa 1 results in a date in Heisei 31.
// To provide the expected result across era boundaries, we first convert the Japanese era system to a Gregorian system, do date math, and then convert back to the Japanese era system.
// This works because the Japanese era system maintains the same year/month boundaries and durations as the Gregorian system and is only different in display value.
if (currentCalendarSystem == CalendarIdentifiers::Japanese)
{
m_calendar->ChangeCalendarSystem(CalendarIdentifiers::Gregorian);
}
if (duration.day != 0)
{
m_calendar->AddDays(-duration.day);
@ -87,21 +97,8 @@ bool DateCalculationEngine::SubtractDuration(_In_ DateTime startDate, _In_ const
}
if (duration.year != 0)
{
// The Japanese Era system can have multiple year partitions within the same year.
// For example, April 30, 2019 is denoted April 30, Heisei 31; May 1, 2019 is denoted as May 1, Reiwa 1.
// The Calendar treats Heisei 31 and Reiwa 1 as separate years, which results in some unexpected behaviors where subtracting a year from Reiwa 1 results in a date in Heisei 31.
// To provide the expected result across era boundaries, we first convert the Japanese era system to a Gregorian system, do date math, and then convert back to the Japanese era system.
// This works because the Japanese era system maintains the same year/month boundaries and durations as the Gregorian system and is only different in display value.
if (currentCalendarSystem == CalendarIdentifiers::Japanese)
{
m_calendar->ChangeCalendarSystem(CalendarIdentifiers::Gregorian);
}
m_calendar->AddYears(-duration.year);
m_calendar->ChangeCalendarSystem(currentCalendarSystem);
}
*endDate = m_calendar->GetDateTime();
}
catch (Platform::InvalidArgumentException^ ex)
@ -113,6 +110,8 @@ bool DateCalculationEngine::SubtractDuration(_In_ DateTime startDate, _In_ const
return false;
}
m_calendar->ChangeCalendarSystem(currentCalendarSystem);
// Check that the UniversalTime value is not negative
return (endDate->UniversalTime >= 0);
}
@ -308,27 +307,24 @@ bool DateCalculationEngine::TryGetCalendarDaysInYear(_In_ DateTime date, _Out_ U
// Adds/Subtracts certain value for a particular date unit
DateTime DateCalculationEngine::AdjustCalendarDate(Windows::Foundation::DateTime date, DateUnit dateUnit, int difference)
{
m_calendar->SetDateTime(date);
// The Japanese Era system can have multiple year partitions within the same year.
// For example, April 30, 2019 is denoted April 30, Heisei 31; May 1, 2019 is denoted as May 1, Reiwa 1.
// The Calendar treats Heisei 31 and Reiwa 1 as separate years, which results in some unexpected behaviors where subtracting a year from Reiwa 1 results in a date in Heisei 31.
// To provide the expected result across era boundaries, we first convert the Japanese era system to a Gregorian system, do date math, and then convert back to the Japanese era system.
// This works because the Japanese era system maintains the same year/month boundaries and durations as the Gregorian system and is only different in display value.
auto currentCalendarSystem = m_calendar->GetCalendarSystem();
if (currentCalendarSystem == CalendarIdentifiers::Japanese)
{
m_calendar->ChangeCalendarSystem(CalendarIdentifiers::Gregorian);
}
switch (dateUnit)
{
case DateUnit::Year:
{
// In the Japanese calendar, transition years have 2 partial years.
// It is not guaranteed that adding 1 year will always add 365 days in the Japanese Calendar.
// To work around this quirk, we will change the calendar system to Gregorian before adding 1 year in the Japanese Calendar case only.
// We will then return the calendar system back to the Japanese Calendar.
auto currentCalendarSystem = m_calendar->GetCalendarSystem();
if (currentCalendarSystem == CalendarIdentifiers::Japanese)
{
m_calendar->ChangeCalendarSystem(CalendarIdentifiers::Gregorian);
}
m_calendar->AddYears(difference);
m_calendar->ChangeCalendarSystem(currentCalendarSystem);
break;
}
case DateUnit::Month:
m_calendar->AddMonths(difference);
break;
@ -337,5 +333,7 @@ DateTime DateCalculationEngine::AdjustCalendarDate(Windows::Foundation::DateTime
break;
}
m_calendar->ChangeCalendarSystem(currentCalendarSystem);
return m_calendar->GetDateTime();
}