此方法用于指示DateTime的此实例是否在当前时区的夏时制时间范围内。
Syntax: public bool IsDaylightSavingTime ();
Return Value: This method returns true if the value of the Kind property is Local or Unspecified and the value of this instance of DateTime is within the daylight saving time range for the local time zone and false if Kind is Utc.
下面的程序说明了DateTime.IsDaylightSavingTime()方法的用法：
范例1：
// C# program to demonstrate the
// DateTime.IsDaylightSavingTime()
// Method
using System;
using System.Globalization;
class GFG {
// Main Method
public static void Main()
{
// creating object of DateTime
DateTime date = new DateTime(2010, 1,
1, 4, 0, 15);
// getting Typecode of date
// using IsDaylightSavingTime() method;
bool value = date.IsDaylightSavingTime();
// checking the condition
if (value)
Console.WriteLine("Instance of DateTime is within the"
+ " daylight saving time range for"+
" the current time zone.");
else
Console.WriteLine("Instance of DateTime is not within the"
+ " daylight saving time range for the "+
"current time zone.");
}
}
输出：
Instance of DateTime is not within the daylight saving time range for the current time zone.
范例2：
// C# program to demonstrate the
// DateTime.IsDaylightSavingTime()
// Method
using System;
using System.Globalization;
class GFG {
// Main Method
public static void Main()
{
// creating object of DateTime
DateTime date = new DateTime(1970, 1,
1, 4, 0, 15);
// getting Typecode of date
// using IsDaylightSavingTime() method;
bool value = date.IsDaylightSavingTime();
// checking the condition
if (value)
Console.WriteLine("Instance of DateTime is within the"
+ " daylight saving time range for "+
"the current time zone.");
else
Console.WriteLine("Instance of DateTime is not within the"
+ " daylight saving time range for the "+
"current time zone.");
}
}
输出：
Instance of DateTime is not within the daylight saving time range for the current time zone.
参考：
- https://docs.microsoft.com/zh-cn/dotnet/api/system.datetime.isdaylightsavingtime?view=netframework-4.7.2