C# 自特定日期以来的秒数

Question

在 C# 3.0 中，如何获取自 2010 年 1 月 1 日以来的秒数？

Answer 1

是这样的：

  TimeSpan test = DateTime.Now - new DateTime(2010, 01, 01);
  MessageBox.Show(test.TotalSeconds.ToString());

为了一个班轮的乐趣：

 MessageBox.Show((DateTime.Now - new DateTime(2010, 01, 01))
     .TotalSeconds.ToString());

Answer 2

您可以减去 2 个 DateTime 实例并得到一个 TimeSpan：

DateTime date = new DateTime(2010,1,1);
TimeSpan diff = DateTime.Now - date;
double seconds = diff.TotalSeconds;

Answer 3

只是为了避免时区问题

 TimeSpan t = (DateTime.UtcNow - new DateTime(2010, 1, 1));

 int timestamp  = (int) t.TotalSeconds;

 Console.WriteLine (timestamp);

Answer 4

这实际上取决于您正在使用谁的 2010-Jan-01 以及您是否希望考虑夏令时。

//I'm currently in Central Daylight Time (Houston, Texas)
DateTime jan1 = new DateTime(2010, 1, 1);

//days since Jan1 + time since midnight
TimeSpan differenceWithDaylightSavings = DateTime.Now - jan1;

//one hour less than above (we "skipped" those 60 minutes about a month ago)
TimeSpan differenceWithoutDaylightSavings = (DateTime.UtcNow - jan1.ToUniversalTime());

//difference for those using UTC and 2010-Jan-01 12:00:00 AM UTC as their starting point
//   (today it's 5 hours longer than differenceWithDaylightSavings)
TimeSpan utcDifference = (DateTime.UtcNow - new DateTime(2010, 1, 1));

Difference with Daylight Savings:     105.15:44:09.7003571
Difference without Daylight Savings:  105.14:44:09.7003571
UTC Difference:                       105.20:44:09.7003571

要获取秒数，请使用 TotalSeconds 属性关闭TimeSpan 对象。

Answer 5

protected void Page_Load(object sender, EventArgs e)
{
    SecondsSinceNow(new DateTime(2010, 1, 1, 0, 0, 0));
}

private double SecondsSinceNow(DateTime compareDate)
{
    System.TimeSpan timeDifference = DateTime.Now.Subtract(compareDate);
    return timeDifference.TotalSeconds;
}

Answer 6

DateTime t1 = DateTime.Now;
DateTime p = new DateTime(2010, 1, 1);

TimeSpan d = t1 - p;

long s = (long)d.TotalSeconds;
MessageBox.Show(s.ToString());