private void ShowResults()
{
// This scenario illustrates time zone support in Windows.Globalization.Calendar class
// Displayed time zones in addition to the local time zone.
string[] timeZones = new[] { "UTC", "America/New_York", "Asia/Kolkata" };
// Store results here.
StringBuilder results = new StringBuilder();
// Create default Calendar object
Calendar calendar = new Calendar();
string localTimeZone = calendar.GetTimeZone();
// Show current time in local time zone
results.AppendLine("Current date and time:");
results.AppendLine(ReportCalendarData(calendar));
// Show current time in additional time zones
foreach (string timeZone in timeZones)
{
calendar.ChangeTimeZone(timeZone);
results.AppendLine(ReportCalendarData(calendar));
}
results.AppendLine();
// Change back to local time zone
calendar.ChangeTimeZone(localTimeZone);
// Show a time on 14th day of second month of next year.
// Note the effect of daylight saving time on the results.
results.AppendLine("Same time on 14th day of second month of next year:");
calendar.AddYears(1); calendar.Month = 2; calendar.Day = 14;
results.AppendLine(ReportCalendarData(calendar));
foreach (string timeZone in timeZones)
{
calendar.ChangeTimeZone(timeZone);
results.AppendLine(ReportCalendarData(calendar));
}
results.AppendLine();
// Change back to local time zone
calendar.ChangeTimeZone(localTimeZone);
// Show a time on 14th day of tenth month of next year.
// Note the effect of daylight saving time on the results.
results.AppendLine("Same time on 14th day of tenth month of next year:");
calendar.AddMonths(8);
results.AppendLine(ReportCalendarData(calendar));
foreach (string timeZone in timeZones)
{
calendar.ChangeTimeZone(timeZone);
results.AppendLine(ReportCalendarData(calendar));
}
results.AppendLine();
// Display the results
OutputTextBlock.Text = results.ToString();
}
/// <summary>
/// This is the click handler for the 'Display' button.
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void Display_Click(object sender, RoutedEventArgs e)
{
// This scenario illustrates TimeZone support in Windows.Globalization.Calendar class
// Displayed TimeZones (other than local timezone)
String[] timeZones = new String[] { "UTC", "America/New_York", "Asia/Kolkata" };
// Store results here.
StringBuilder results = new StringBuilder();
// Create default Calendar object
Calendar calendar = new Calendar();
String localTimeZone = calendar.GetTimeZone();
// Show current time in timezones desired to be displayed including local timezone
results.AppendLine("Current date and time -");
results.AppendLine(GetFormattedCalendarDateTime(calendar));
foreach (String timeZone in timeZones)
{
calendar.ChangeTimeZone(timeZone);
results.AppendLine(GetFormattedCalendarDateTime(calendar));
}
results.AppendLine();
calendar.ChangeTimeZone(localTimeZone);
// Show a time on 14th day of second month of next year in local, GMT, New York and Indian Time Zones
// This will show if there were day light savings in time
results.AppendLine("Same time on 14th day of second month of next year -");
calendar.AddYears(1); calendar.Month = 2; calendar.Day = 14;
results.AppendLine(GetFormattedCalendarDateTime(calendar));
foreach (String timeZone in timeZones)
{
calendar.ChangeTimeZone(timeZone);
results.AppendLine(GetFormattedCalendarDateTime(calendar));
}
results.AppendLine();
calendar.ChangeTimeZone(localTimeZone);
// Show a time on 14th day of 10th month of next year in local, GMT, New York and Indian Time Zones
// This will show if there were day light savings in time
results.AppendLine("Same time on 14th day of tenth month of next year -");
calendar.AddMonths(8);
results.AppendLine(GetFormattedCalendarDateTime(calendar));
foreach (String timeZone in timeZones)
{
calendar.ChangeTimeZone(timeZone);
results.AppendLine(GetFormattedCalendarDateTime(calendar));
}
results.AppendLine();
// Display the results
rootPage.NotifyUser(results.ToString(), NotifyType.StatusMessage);
}
public static List<DateTime> GetNextDueDate(String repeatFlag, DateTime dueDate, String repeatFrom, DateTime completedTime, String timeZone, int limit)
{
List<DateTime> dueDates = new List<DateTime>();
if (string.IsNullOrEmpty(repeatFlag) || dueDate == null)
{
return dueDates;
}
bool isLunar;
try
{
TickRRule rRule = new TickRRule(repeatFlag);
isLunar = rRule.IsLunarFrequency();
if (IsRepeatFromCompleteTime(repeatFrom, completedTime))
{
// update rRule, We must clear byDay and byMonthDay when the
// task repeat from completedTime.
rRule.SetByDay(new List<IWeekDay>());
rRule.SetByMonthDay(new int[0]);
repeatFlag = rRule.ToTickTickIcal();
}
if (rRule.GetCompletedRepeatCount() >= rRule.GetCount())
{
return dueDates;
}
if (string.IsNullOrEmpty(timeZone))
{
timeZone = NodaTime.DateTimeZoneProviders.Tzdb.GetSystemDefault().Id;
}
DateTimeZone taskTimeZone = DateTimeZoneProviders.Tzdb.GetZoneOrNull(timeZone); //.getTimeZone(timeZone);
// TODO 有问题 阳历
//GregorianCalendar taskCal = new GregorianCalendar(taskTimeZone);
//GregorianCalendar utcCal = new GregorianCalendar(TimeUtils.utcTimezone());
Calendar taskCal = new Calendar();
taskCal.ChangeTimeZone(taskTimeZone.Id);
Calendar utcCal = new Calendar();
utcCal.ChangeTimeZone(DateTimeZoneProviders.Tzdb.GetSystemDefault().Id);
DateTime taskStart = InitRepeatStartDate(repeatFrom, completedTime, dueDate, taskCal);
DateTime utcStart = ConvertDateToUTCDate(taskStart, taskCal, utcCal);
long untilDateTime = GetTimeFromDateValue(rRule.GetUntil());
if (isLunar)
{
//DateTime now = DateTime.UtcNow; // TODO 为什么要这么写？ DateTimeUtils.GetCurrentDate();
////当前时间已经超过截止重复时间，必定没有下个有效的重复时间
//if (isAfterUntilDate(now, untilDateTime))
//{
// return dueDates;
//}
//GregorianCalendar start = new GregorianCalendar();
//start.setTime(dueDate);
//Date next = getNextLunarDueDate(start, rRule);
//int i = 0;
//while (next != null && dueDates.size() < limit && !isAfterUntilDate(next,
// untilDateTime))
//{
// start.setTime(next);
// next = getNextLunarDueDate(start, rRule);
// if (next != null && !now.after(next))
// {
// dueDates.add(next);
// }
// if (i++ > 1000)
// {
// break;
// }
//}
//if (dueDates.isEmpty())
//{
// Log.e(TAG, "Get next due_date error: repeatFlag = " + repeatFlag);
//}
//return dueDates;
}
String rRuleString = rRule.ToIcal();
if (untilDateTime > 0)
{
rRuleString = RemoveKeyValueFromRRule(TickRRule.UNTIL_KEY, rRuleString);
}
// TODO 这是干嘛的。。。
//DateIterator di = DateIteratorFactory.createDateIterator(rRuleString, utcStart, TimeUtils.utcTimezone(), true);
if (Constants.RepeatFromStatus.DEFAULT.Equals(repeatFrom)
|| string.IsNullOrEmpty(repeatFrom))
{
// Repeat from default, next dueDate 不会返回小于Now
DateTime utcNow = ConvertDateToUTCDate(DateTime.UtcNow, taskCal, utcCal);//(DateTimeUtils.getCurrentDate(), taskCal, utcCal);
// TODO advanceTo 是什么，比什么早？
//if (utcNow > utcStart)
//{
// di.advanceTo(utcNow);
//}
}
DateTime next;
int count = 0;
//while (di.hasNext() && dueDates.Count < limit)
//{
// next = ConvertUtcDateToDate(di.next(), taskCal, utcCal);
// if (next > taskStart)
// {
// //得到的下次重复时间已超过截止重复时间，无效
// if (IsAfterUntilDate(next, untilDateTime))
// {
// return dueDates;
// }
// else
// {
// dueDates.Add(next);
// }
// }
// if (count++ > 10000)
// {
// // 对极端的情况跳出来，不要循环了。
// break;
// }
//}
}
catch (Exception e)
{
//Log.e(TAG, "Get next due_date error: repeatFlag = " + repeatFlag, e);
}
return dueDates;
}