TimeZoneInfo.TransitionTime.DayOfWeek Property
Important
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Gets the day of the week on which the time change occurs.
public:
property DayOfWeek DayOfWeek { DayOfWeek get(); };
public DayOfWeek DayOfWeek { get; }
member this.DayOfWeek : DayOfWeek
Public ReadOnly Property DayOfWeek As DayOfWeek
The day of the week on which the time change occurs.
The following example enumerates the time zones found on the local computer and displays transition time information for all floating-date transitions. The time information includes the day of the week on which the time change occurs.
private enum WeekOfMonth
{
First = 1,
Second = 2,
Third = 3,
Fourth = 4,
Last = 5
}
private void GetFloatingTransitionTimes()
{
ReadOnlyCollection<TimeZoneInfo> timeZones = TimeZoneInfo.GetSystemTimeZones();
foreach (TimeZoneInfo zone in timeZones)
{
TimeZoneInfo.AdjustmentRule[] adjustmentRules = zone.GetAdjustmentRules();
DateTimeFormatInfo dateInfo = CultureInfo.CurrentCulture.DateTimeFormat;
foreach (TimeZoneInfo.AdjustmentRule adjustmentRule in adjustmentRules)
{
TimeZoneInfo.TransitionTime daylightStart = adjustmentRule.DaylightTransitionStart;
if (! daylightStart.IsFixedDateRule)
Console.WriteLine("{0}, {1:d}-{2:d}: Begins at {3:t} on the {4} {5} of {6}.",
zone.StandardName,
adjustmentRule.DateStart,
adjustmentRule.DateEnd,
daylightStart.TimeOfDay,
((WeekOfMonth)daylightStart.Week).ToString(),
daylightStart.DayOfWeek.ToString(),
dateInfo.GetMonthName(daylightStart.Month));
TimeZoneInfo.TransitionTime daylightEnd = adjustmentRule.DaylightTransitionEnd;
if (! daylightEnd.IsFixedDateRule)
Console.WriteLine("{0}, {1:d}-{2:d}: Ends at {3:t} on the {4} {5} of {6}.",
zone.StandardName,
adjustmentRule.DateStart,
adjustmentRule.DateEnd,
daylightEnd.TimeOfDay,
((WeekOfMonth)daylightEnd.Week).ToString(),
daylightEnd.DayOfWeek.ToString(),
dateInfo.GetMonthName(daylightEnd.Month));
}
}
}
type WeekOfMonth =
| First = 1
| Second = 2
| Third = 3
| Fourth = 4
| Last = 5
let getFloatingTransitionTimes () =
let timeZones = TimeZoneInfo.GetSystemTimeZones()
for zone in timeZones do
let adjustmentRules = zone.GetAdjustmentRules()
let dateInfo = CultureInfo.CurrentCulture.DateTimeFormat
for adjustmentRule in adjustmentRules do
let daylightStart = adjustmentRule.DaylightTransitionStart
if not daylightStart.IsFixedDateRule then
printfn $"{zone.StandardName}, {adjustmentRule.DateStart:d}-{adjustmentRule.DateEnd:d}: Begins at {daylightStart.TimeOfDay:t} on the {enum<WeekOfMonth> daylightStart.Week} {daylightStart.DayOfWeek} of {dateInfo.GetMonthName daylightStart.Month}."
let daylightEnd = adjustmentRule.DaylightTransitionEnd
if not daylightEnd.IsFixedDateRule then
printfn $"{zone.StandardName}, {adjustmentRule.DateStart:d}-{adjustmentRule.DateEnd:d}: Ends at {daylightEnd.TimeOfDay:t} on the {enum<WeekOfMonth> daylightEnd.Week} {daylightEnd.DayOfWeek} of {dateInfo.GetMonthName daylightEnd.Month}."
Private Enum WeekOfMonth As Integer
First = 1
Second = 2
Third = 3
Fourth = 4
Last = 5
End Enum
Private Sub GetFloatingTransitionTimes()
Dim timeZones As ReadOnlyCollection(Of TimeZoneInfo) = TimeZoneInfo.GetSystemTimeZones()
For Each zone As TimeZoneInfo In timeZones
Dim adjustmentRules() As TimeZoneInfo.AdjustmentRule = zone.GetAdjustmentRules()
For Each adjustmentRule As TimeZoneInfo.AdjustmentRule in adjustmentRules
Dim daylightStart As TimeZoneInfo.TransitionTime = adjustmentRule.DaylightTransitionStart
If Not daylightStart.IsFixedDateRule Then
Console.WriteLine("{0}, {1:d}-{2:d}: Begins at {3:t} on the {4} {5} of {6}.", _
zone.StandardName, _
adjustmentRule.DateStart, _
adjustmentRule.DateEnd, _
daylightStart.TimeOfDay, _
CType(daylightStart.Week, WeekOfMonth).ToString(), _
daylightStart.DayOfWeek.ToString(), _
MonthName(daylightStart.Month))
End If
Dim daylightEnd As TimeZoneInfo.TransitionTime = adjustmentRule.DaylightTransitionEnd
If Not daylightEnd.IsFixedDateRule Then
Console.WriteLine("{0}, {1:d}-{2:d}: Ends at {3:t} on the {4} {5} of {6}.", _
zone.StandardName, _
adjustmentRule.DateStart, _
adjustmentRule.DateEnd, _
daylightEnd.TimeOfDay, _
CType(daylightEnd.Week, WeekOfMonth).ToString(), _
daylightEnd.DayOfWeek.ToString(), _
MonthName(daylightEnd.Month))
End If
Next
Next
End Sub
The DayOfWeek property returns a valid value only if the IsFixedDateRule property is false
.
The DayOfWeek property indicates the day of the week on which a floating-date rule is applied (for example, the second Sunday of November). In contrast, the Day property indicates the day of the month on which a fixed-date rule is applied (for example, April 15).
Product | Versions |
---|---|
.NET | Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9 |
.NET Framework | 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1 |
.NET Standard | 2.0, 2.1 |
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