C#自特定日期起的秒数

在C#3.0中，如何获得自2010年1月1日以来的秒数？

您可以减去2个日期时间实例并获得时间跨度：

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

是这样的：

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

对于一个班轮乐趣：

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

---

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);

---

这实际上是一个你正在使用谁的2010年1月1日，以及你是否希望考虑夏令时的问题

//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));

与夏令时的差异：105.15:44:09.7003571 没有夏令时的差异：105.14:44:09.7003571 UTC差异：105.20:44:09.7003571

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要获取秒数，请使用TimeSpan对象的属性。

@Psytronic然后

MessageBox.Show（（DateTime.Now-new DateTime（2010,01,01））.TotalSeconds.ToString（）应该获得各种投票。ViewData[“计数器乘数”]=（DateTime.Now-new DateTime（2010,01,01））.TotalSeconds.ToString（）；WinS假设您尚未处于UTC/GMT，这会导致时区问题。您还需要将2010年1月1日转换为UTC（
newdatetime（2010,1,1）.ToUniversalTime（）
）。更大的问题是你可能需要担心夏令时。
DateTime t1 = DateTime.Now;
DateTime p = new DateTime(2010, 1, 1);

TimeSpan d = t1 - p;

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

//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