DateTime上下舍入 [英] DateTime Round Up and Down

问题描述

我一直在寻找一种合适的舍入机制，但我发现似乎没有什么正是我所需要的.

Ive been looking for a proper rounding mechanism but nothing I find seems to be exactly what I need.

我需要分别向上舍入和向下舍入，并且还需要考虑已经舍入的情况.

I need to round up and round down seperately and I also need to account for the the case when its already rounded.

我需要进行以下舍入操作

I need the following rounding to happen

5:00 -> RoundDown() -> 5:00
5:04 -> RoundDown() -> 5:00
5:09 -> RoundDown() -> 5:00
5:10 -> RoundDown() -> 5:10

4:00 -> RoundUp() -> 4:00
4:50 -> RoundUp() -> 4:50
4:51 -> RoundUp() -> 5:00
4:56 -> RoundUp() -> 5:00 

基本上，我需要将它显式地取到RoundUp()或RoundDown()到最近的10分钟，但是如果已经是10分钟的倍数，它也应该保持原样.另外，我想截断任何秒数，因为它们对舍入过程没有影响

Basically I need it to RoundUp() or RoundDown() to the nearest 10 minutes explicitly but it should also leave time untouched if it already is in a multiple of 10 minutes. Also I'd like to truncate any seconds to that they have no effect on the rounding procedure

4:50:45-> 4:50:00-> RoundUp()-> 4:50

4:50:45 -> 4:50:00 -> RoundUp() -> 4:50

任何人都没有方便的代码来完成此操作.

Does anyone have any handy code to accomplish this.

我在某处找到了此代码，但是将其四舍五入到5:00-> RoundUp()-> 5:10，而不是保留它不变，因为它已经是10的倍数并且不需要四舍五入.我也不确定几秒钟会如何影响

I found this code somewhere but it rounds 5:00 -> RoundUp() -> 5:10 rather than leaving it intact because its already a multiple of 10 and needs no rounding. Also Im not sure how seconds would effect it

public static DateTime RoundDateTime(this DateTime dt, int minutes, RoundingDirection direction)
{
    TimeSpan t;
    switch (direction)
    {
        case RoundingDirection.Up:
            t = (dt.Subtract(DateTime.MinValue)).Add(new TimeSpan(0, minutes, 0)); break;
        case RoundingDirection.Down:
            t = (dt.Subtract(DateTime.MinValue)); break;
        default:
            t = (dt.Subtract(DateTime.MinValue)).Add(new TimeSpan(0, minutes / 2, 0)); break;
    }
    return DateTime.MinValue.Add(new TimeSpan(0,
           (((int)t.TotalMinutes) / minutes) * minutes, 0));
}

希望有人可以编辑该方法以使其对我有用.谢谢

Hope someone can edit that method to make it work for me. Thanks

推荐答案

怎么样:

case RoundingDirection.Up:
    t = dt.AddMinutes((60 - dt.Minute) % 10);
case RoundingDirection.Down:
    t = dt.AddMinutes(-dt.Minute % 10);

演示: http://ideone.com/AlB7Q

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