Gmt Time Daylight Savings

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Definition

Indicates whether a specified date and time falls in the range of daylight saving time for the current TimeZoneInfo object's time zone.

2020 Daylight Saving Time (DST) began in USA and Canada on 8 March (see US exceptions here) and ended on 1 November In Europe, DST started in 2020 on 29 March and ended on 25 October Europe (European Union) Daylight Saving Dates Read more on Daylight Saving Time rules. This time zone converter lets you visually and very quickly convert GMT to EDT and vice-versa. Simply mouse over the colored hour-tiles and glance at the hours selected by the column. GMT stands for Greenwich Mean Time. EDT is known as Eastern Daylight Time. Note that most countries in the GMT-4 time zone don't actually have any daylight saving changes, so you might find that the offset is always exactly the same, depending on the country.

Overloads

IsDaylightSavingTime(DateTimeOffset)

Indicates whether a specified date and time falls in the range of daylight saving time for the time zone of the current TimeZoneInfo object.

IsDaylightSavingTime(DateTime)

Indicates whether a specified date and time falls in the range of daylight saving time for the time zone of the current TimeZoneInfo object.

Daylight Saving Time or summer time, -except Lord Howe Island- it is 1h. More with respect to the standard o local time zone. Winter Time or Standard local time UTC/ GMT, is the one used the rest of the year, when there is no DST summer time. Do not use daylight saving time throughout the year. (No Daylight Saving Time).

Indicates whether a specified date and time falls in the range of daylight saving time for the time zone of the current TimeZoneInfo object.

Gmt Time Daylight Savings 2019

Parameters

dateTimeOffset
DateTimeOffset

A date and time value.

Returns

Boolean
Daylight

true if the dateTimeOffset parameter is a daylight saving time; otherwise, false.

Remarks

The return value of TimeZoneInfo.IsDaylightSavingTime is affected by the relationship between the time zone represented by the TimeZoneInfo object and the Offset property of the dateTimeOffset parameter. If dateTimeOffset does not correspond to the current time zone's offset from Coordinated Universal Time (UTC), the method converts that time to the time in the current time zone. It then determines whether that date and time is a daylight saving time.

If the time zone represented by the TimeZoneInfo object does not support daylight saving time, the method always returns false. To determine whether a time zone supports daylight saving time, retrieve the value of its SupportsDaylightSavingTime property.

See also

Indicates whether a specified date and time falls in the range of daylight saving time for the time zone of the current TimeZoneInfo object.

Parameters

Returns

Boolean

true if the dateTime parameter is a daylight saving time; otherwise, false.

Exceptions

The Kind property of the dateTime value is Local and dateTime is an invalid time.

Examples

Central Daylight Savings Time Gmt

The following example defines a method named DisplayDateWithTimeZoneName that uses the TimeZoneInfo.IsDaylightSavingTime method to determine whether to display a time zone's standard time name or daylight saving time name.

Remarks

The return value of TimeZoneInfo.IsDaylightSavingTime is affected by the relationship between the time zone represented by the TimeZoneInfo object and the Kind property of the dateTime parameter, as the following table shows.

TimeZoneInfo objectDateTime.Kind propertyResult
TimeZoneInfo.LocalDateTimeKind.LocalDetermines whether dateTime is daylight saving time.
TimeZoneInfo.LocalDateTimeKind.UtcConverts dateTime from Coordinated Universal Time (UTC) to local time and determines whether it is daylight saving time.
TimeZoneInfo.LocalDateTimeKind.UnspecifiedAssumes that dateTime represents local time and determines whether it is daylight saving time.
TimeZoneInfo.UtcDateTimeKind.Local, DateTimeKind.Unspecified, or DateTimeKind.UtcReturns false (UTC does not support daylight saving time).
Any other TimeZoneInfo object.DateTimeKind.LocalConverts the local time to the equivalent time of the TimeZoneInfo object and then determines whether the latter is daylight saving time.
Any other TimeZoneInfo object.DateTimeKind.UtcConverts UTC to the equivalent time of the TimeZoneInfo object and then determines whether the latter is daylight saving time.
Any other TimeZoneInfo object.DateTimeKind.UnspecifiedDetermines whether dateTime is daylight saving time.

If the time zone represented by the TimeZoneInfo object does not support daylight saving time, the method always returns false. A number of time zones, including Utc, do not observe daylight saving time. To determine whether a time zone supports daylight saving time, retrieve the value of its SupportsDaylightSavingTime property.

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If the dateTime parameter specifies an ambiguous time in the current object's time zone, the TimeZoneInfo.IsDaylightSavingTime method interprets dateTime as standard time and returns false if its Kind property is DateTimeKind.Local or DateTimeKind.Unspecified. If the Kind property is DateTimeKind.Utc, this method will select the correct ambiguous time and indicate whether it is a daylight saving time.

Because the TimeZoneInfo.IsDaylightSavingTime(DateTime) method can return false for a date and time that is ambiguous (that is, a date and time that can represent either a standard time or a daylight saving time in a particular time zone), the TimeZoneInfo.IsAmbiguousTime(DateTime) method can be paired with the IsDaylightSavingTime(DateTime) method to determine whether a time may be a daylight saving time. Because an ambiguous time is one that can be both a daylight saving time and a standard time, the IsAmbiguousTime(DateTime) method can be called first to determine whether a date and time may be a daylight saving time. If the method returns false, the IsDaylightSavingTime(DateTime) method can be called to determine whether the DateTime value is a daylight saving time. The following example illustrates this technique.

If the dateTime parameter specifies an invalid time, the method call throws an ArgumentException if the value of the dateTime parameter's Kind property is DateTimeKind.Local; otherwise, the method returns false.

Call the TimeZoneInfo.IsDaylightSavingTime method to determine whether to use a time zone's StandardName value or its DaylightName value when displaying the time zone name. See the Example section for an illustration.

See also

Gmt Time Daylight Savings

Applies to