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2021-10-28 Fred Gleason <fredg@paravelsystems.com>

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* Refactored the 'RDTimeEngine::StartEvent()' method to account for
	Daylight Saving Time transitions properly.

Signed-off-by: Fred Gleason <fredg@paravelsystems.com>
This commit is contained in:
Fred Gleason 2021-10-29 11:56:51 -04:00
parent ca60833fed
commit 3a102c03e6
3 changed files with 67 additions and 6 deletions
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3
ChangeLog
View File

@ -22562,3 +22562,6 @@
* Fixed a bug in the 'Edit Audio' dialog in rdlibrary(1) that
would set the initial position of a newly-added marker off-screen
when the waveform view port was scrolled to the right.
2021-10-28 Fred Gleason <fredg@paravelsystems.com>
* Refactored the 'RDTimeEngine::StartEvent()' method to account for
Daylight Saving Time transitions properly.

65
lib/rdtimeengine.cpp
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@ -84,12 +84,67 @@ void RDTimeEngine::timerData(int id)
void RDTimeEngine::StartEvent(int id)
{
QTime now=QTime::currentTime();
int interval=now.msecsTo(d_times.value(id));
//
// Maintainer's Note
//
// In order to account for Daylight Saving Time (DST) transitions properly,
// calculations for the timer interval *must* be done using QDateTime,
// *not* QTime!
//
// See the Qt documentation for the QDateTime and QTimeZone classes for
// discussion of DST and its implications.
//
QDateTime now=QDateTime::currentDateTime();
QDateTime then=QDateTime(now.date(),d_times.value(id));
if(interval<0) { // Crosses midnight
interval=
now.msecsTo(QTime(23,59,59))+1000+QTime(0,0,0).msecsTo(d_times.value(id));
if((now.time()>d_times.value(id))||(!then.isValid())) {
//
// Ensure that the advanced date/time is valid, in case we land on a
// "non-existent" date/time --e.g. during a DST "spring forward"
// transition.
//
do {
then.setDate(then.date().addDays(1));
}
while(!then.isValid());
}
int interval=now.msecsTo(then);
d_timers.value(id)->start(1+interval);
/*
printf("ID %d set interval %d mS [%s] for scheduled time %s\n",id,interval,
QTime(0,0,0).addMSecs(interval).toString("hh:mm:ss.zzz").toUtf8().constData(),
d_times.value(id).toString("hh:mm:ss.zzz").toUtf8().constData());
*/
}
void RDTimeEngine::DumpTimeZone(const QTimeZone &tz) const
{
QTimeZone::OffsetData offset;
printf("id: %s\n",tz.id().constData());
printf("isValid: %u\n",tz.isValid());
printf("hasTransitions: %u\n",tz.hasTransitions());
if(tz.hasTransitions()) {
offset=tz.nextTransition(QDateTime::currentDateTime());
if(offset.atUtc.isValid()) {
printf(" next ");
DumpTransition(offset);
}
offset=tz.previousTransition(QDateTime::currentDateTime());
if(offset.atUtc.isValid()) {
printf(" previous ");
DumpTransition(offset);
}
}
}
void RDTimeEngine::DumpTransition(QTimeZone::OffsetData offset) const
{
printf("transition: %s UTC\n",offset.atUtc.toString("yyyy-MM-ddThh:mm:ss.zzz").toUtf8().constData());
printf(" offsetFromUtc: %d secs\n",offset.offsetFromUtc);
printf(" standardTimeOffset: %d secs\n",offset.standardTimeOffset);
printf(" daylightTimeOffset: %d secs\n",offset.daylightTimeOffset);
printf(" abbreviation: %s\n",offset.abbreviation.toUtf8().constData());
}

5
lib/rdtimeengine.h
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@ -1,6 +1,6 @@
// rdtimeengine.h
//
// An event timer engine.
// Event timer engine.
//
// (C) Copyright 2002-2021 Fred Gleason <fredg@paravelsystems.com>
//
@ -26,6 +26,7 @@
#include <QObject>
#include <QSignalMapper>
#include <QTimer>
#include <QTimeZone>
class RDTimeEngine : public QObject
{
@ -46,6 +47,8 @@ class RDTimeEngine : public QObject
private:
void StartEvent(int id);
void DumpTimeZone(const QTimeZone &tz) const;
void DumpTransition(QTimeZone::OffsetData offset) const;
QMap<int,QTime> d_times;
QMap<int,QTimer *> d_timers;
QSignalMapper *d_mapper;