如何仅更改DateTime的日期部分，同时保留时间部分？ [英] How to change only the date portion of a DateTime, while keeping the time portion?

问题描述

我在代码中使用了许多DateTime。我想将那些DateTimes更改为我的特定日期，并保留
时间。

I use many DateTime in my code. I want to change those DateTimes to my specific date and keep time.

1. "2012/02/02 06:00:00" => "2015/12/12 : 06:00:00"
2. "2013/02/02 12:00:00" => "2015/12/12 : 12:00:00"

我使用此样式进行更改，但是

I use this style to change, but it seem not the good way and I want to ask have any way to achieve this task.

DateTime newDateTime = new DateTime(2015,12,12,oldDateTime.Hour,oldDateTime.Minute,0);

推荐答案

根据您提供的信息，我认为这种方法很好如果要避免经常重写 oldDateTime.Hour，oldDateTime.Minute，0 片段，则可以创建自己的静态类以简化方法调用。

With the information you have given, I think this method is fine. If you want to avoid rewriting the oldDateTime.Hour,oldDateTime.Minute,0 piece often, you could create your own static class to simplify the method calls.

在您的常规应用中：

class Program
{
    static void Main(string[] args)
    {
        DateTime time = DateTime.Now;
        DateTime newDateTime = MyDateTimeUtil.CreateDateFromTime(2015, 12, 12, time);
    }
}

创建 DateTime 值：

public static class MyDateTimeUtil
{
    public static DateTime CreateDateFromTime(int year, int month, int day, DateTime time)
    {
        return new DateTime(year, month, day, time.Hour, time.Minute, 0);
    }
}

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