我如何才能改变我的DateTime变量“s”的时间?
DateTime s = some datetime;
我如何才能改变我的DateTime变量“s”的时间?
DateTime s = some datetime;
当前回答
由于DateTime是不可变的,所以当需要更改日期组件时,必须创建一个新实例。不幸的是,没有内置功能来设置DateTime实例的各个组件。
使用以下扩展方法
public static DateTime SetPart(this DateTime dateTime, int? year, int? month, int? day, int? hour, int? minute, int? second)
{
return new DateTime(
year ?? dateTime.Year,
month ?? dateTime.Month,
day ?? dateTime.Day,
hour ?? dateTime.Hour,
minute ?? dateTime.Minute,
second ?? dateTime.Second
);
}
public static DateTime SetYear(this DateTime dateTime, int year)
{
return dateTime.SetPart(year, null, null, null, null, null);
}
public static DateTime SetMonth(this DateTime dateTime, int month)
{
return dateTime.SetPart(null, month, null, null, null, null);
}
public static DateTime SetDay(this DateTime dateTime, int day)
{
return dateTime.SetPart(null, null, day, null, null, null);
}
public static DateTime SetHour(this DateTime dateTime, int hour)
{
return dateTime.SetPart(null, null, null, hour, null, null);
}
public static DateTime SetMinute(this DateTime dateTime, int minute)
{
return dateTime.SetPart(null, null, null, null, minute, null);
}
public static DateTime SetSecond(this DateTime dateTime, int second)
{
return dateTime.SetPart(null, null, null, null, null, second);
}
您可以设置单独的DateTime组件,如
var now = DateTime.Now;
now.SetSecond(0);
其他回答
设定一天的结束:
date = new DateTime(date.Year, date.Month, date.Day, 23, 59, 59);
这难道不能解决你的问题吗?
Dateime dt = DateTime.Now;
dt = dt.AddSeconds(10);
DateTime出了什么问题。AddSeconds方法,您可以添加或减去秒?
最好的解决方案是:
currdate.AddMilliseconds(currdate.Millisecond * -1).AddSeconds(currdate.Second * -1).AddMinutes(currdate.Minute * -1).AddHours(currdate.Hour * -1);
//The fastest way to copy time
DateTime justDate = new DateTime(2011, 1, 1); // 1/1/2011 12:00:00AM the date you will be adding time to, time ticks = 0
DateTime timeSource = new DateTime(1999, 2, 4, 10, 15, 30); // 2/4/1999 10:15:30AM - time tick = x
justDate = new DateTime(justDate.Date.Ticks + timeSource.TimeOfDay.Ticks);
Console.WriteLine(justDate); // 1/1/2011 10:15:30AM
Console.Read();