更改迄今为止的天数答案

【问题标题】：change a number of days to date更改迄今为止的天数
【发布时间】：2015-08-06 21:35:07
【问题描述】：

如何使用 C# 中的 DateTime 类将天数更改为（年、月和日）。实际上我想用生日来计算确切的出生日期。 ?年?月....?秒。

我的代码：

DateTime a = new DateTime(1993, 6, 10, 0, 0, 0);
            DateTime now = new DateTime(DateTime.Now.Year, DateTime.Now.Month, DateTime.Now.Day, DateTime.Now.Hour
                ,DateTime.Now.Minute,DateTime.Now.Second);
            TimeSpan b = now - a;
            int c = b.Days;

【问题讨论】：

标签： c# datetime timespan

【解决方案1】：

您可以使用NodaTime

var period = NodaTime.Period.Between(
                new NodaTime.LocalDateTime(1993, 6, 10, 0, 0), 
                NodaTime.LocalDateTime.FromDateTime(DateTime.Now) );

Console.WriteLine("{0} {1} {2} {3} {4}",period.Years,period.Months,period.Days,
                                        period.Hours,period.Minutes);

【讨论】：

【解决方案2】：

我没有看到任何简单的功能。即无法使用简单的 DateTime 函数来做到这一点。但是，如果我将它放入代码中，它看起来像这样：

DateTime birthday = new DateTime(1993, 6, 10);
DateTime current;
DateTime nowComparison = DateTime.Now;
int years = nowComparison.Year - birthday.Year;
if (nowComparison < birthday.AddYears(years))
    years -= 1;
current = birthday.AddYears(years); // current is less than a year ago.

int months;
if(current.Year != nowComparison.Year)
{
    months = nowComparison.Month + (12 - current.Month);
}
else
{
    months = nowComparison.Month - current.Month;
}
if (nowComparison < current.AddMonths(months))
    months -= 1;
current = current.AddMonths(months); // current is less than a month ago.

int days = nowComparison.Subtract(current).Days;
current = current.AddDays(days); // current is less than a day ago.

int hours = nowComparison.Subtract(current).Hours;
current = current.AddHours(hours); // current is less than an hour ago.

int minutes = nowComparison.Subtract(current).Minutes;
current = current.AddMinutes(minutes); // current is less than a minute ago.

int seconds = nowComparison.Subtract(current).Seconds;
current = current.AddSeconds(seconds); // current is less than a second ago.

【讨论】：