TimeZoneInfo.TransitionTime.DayOfWeek 屬性
定義
重要
部分資訊涉及發行前產品,在發行之前可能會有大幅修改。 Microsoft 對此處提供的資訊,不做任何明確或隱含的瑕疵擔保。
取得發生時間變更的當週日次。
public:
property DayOfWeek DayOfWeek { DayOfWeek get(); };
public DayOfWeek DayOfWeek { get; }
member this.DayOfWeek : DayOfWeek
Public ReadOnly Property DayOfWeek As DayOfWeek
屬性值
發生時間變更的當週日次。
範例
下列範例會列舉在本機電腦上找到的時區,並顯示所有浮點日期轉換的轉換時間資訊。 時間資訊包括發生時間變更的星期數。
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
備註
只有在 屬性為 false
時, IsFixedDateRule 屬性 DayOfWeek 才會傳回有效的值。
屬性 DayOfWeek 會指出套用浮點日期規則的星期幾,例如, (11 月的第二個星期日) 。 相反地, Day 屬性會指出套用固定日期規則的月份日期 (,例如 4 月 15 日) 。