如何准确地得到两个DateTime对象之间的差异"十年" [关闭，使用NodaTime] [英] How to accurately get difference between two DateTime object in "Years" [Closed, use NodaTime]

问题描述

如何准确地获得十年两个的DateTime 对象之间的差异（年）？

How to accurately get difference(in years) between two DateTime objects in "Years"?

DateTime.Subtract（）给出时间跨度的差异，最大面额为天。

DateTime.Subtract() gives difference in TimeSpan and the maximum denomination is Days.

所以，如果我想获得准确的，如今，一天之间在1988年的差异（比如1988年3月29日），有一个更简单的方式来获得？此人的准确年龄

So, if I would want to get accurately, the difference between Today and a day in 1988(say 29th March 1988), is there an "easier" way to get the accurate age of this person?

我已经试过是：

DateTime March291988 = DateTime.Parse("29/03/1988");
TimeSpan ts = DateTime.Now.Subtract(March291988);
int years = (ts.Days/365);

更​​重要的是，问题是：如何从时间跨度转换为DateTime

More importantly, the question is: How to convert from TimeSpan to DateTime.

推荐答案

我有偏见，但我会使用野田佳彦时间：

I'm biased, but I'd use Noda Time:

var date1 = new LocalDate(1988, 3, 29);
var date2 = new LocalDate(2013, 1, 23); // See note below
var years = Period.Between(date1, date2, PeriodUnits.Years).Years;

基本上BCL不能提供的东西这样工作的一个非常简单的方法 - 你真的不的希望有一个时间跨度，因为它没有固定到特定的开始/结束点。您可以从另一个减去一个年度的值，然后调整，如果它做错误的事情，但它是一个有点恶心。

Basically the BCL doesn't provide a hugely easy way of working with things like this - you really don't want a TimeSpan, because it's not anchored to a specific start/end point. You can subtract one Year value from another and then adjust if it does the wrong thing, but it's a bit icky.

现在在你的原代码，您使用 DateTime.Now 。野田的时候，我们把时钟作为一个依赖， SystemClock.Instance 是正常的生产实施。一个 IClock 不知道时区 - 它只知道当前的时间瞬间 - 让你不得不说你是哪个时区兴趣，例如：

Now in your original code, you used DateTime.Now. In Noda Time, we treat a clock as a dependency, with SystemClock.Instance being the normal production implementation. An IClock doesn't know about time zones - it just knows the current instant in time - so you have to say which time zone you're interested in. For example:

var today = clock.Now.InZone(zone).LocalDateTime.Date;

我知道这好像啰嗦，但它的隔离各种不同的转换，使这一切更明确。 （我可能会推出日期在 ZoneDateTime 属性，以稍微降低这一点。）

I know this seems long-winded, but it's isolating all the different conversions to make it all more explicit. (I may introduce a Date property on ZoneDateTime to reduce this slightly.)

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