How Can I Efficiently Calculate the Difference Between Two Dates in C#?

C#medium -efficient calculation date method

In various programming scenarios, determining the difference between the number of days between the two dates is a common task. In C#, there are many ways to calculate this difference, including the use of

classes and

structures. Date TimeSpan Use DateSpan structure

A simple way to calculate the difference between the number of days between the two dates is to use the class to represent two dates, and then reduce them to obtain a

object:

Date TimeSpan This code uses the

attributes of the object to retrieve the number of days between the start date and the end date. The results in this example are 66, which is the number of days from January 1st to March 8th, 2023.

<code class="language-csharp">DateTime startDate = new DateTime(2023, 1, 1);
DateTime endDate = new DateTime(2023, 3, 8);
TimeSpan days = endDate - startDate;
Console.WriteLine(days.TotalDays); // 输出：66</code>

Use Math class TimeSpan TotalDays

Another way to calculate the difference between the days between the dates is to use the

method to find the absolute difference between the two date values ​​represented by scale:

This method depends on the

attributes of the Math.Abs() class, which returns the scale of the scale (100 nan seconds) since the beginning of the Gauogen Gaoli calendar. By removing this difference in the number of daily scale, we get the number of days between two dates.

<code class="language-csharp">long startDateTicks = new DateTime(2023, 1, 1).Ticks;
long endDateTicks = new DateTime(2023, 3, 8).Ticks;
long days = Math.Abs(endDateTicks - startDateTicks) / TimeSpan.TicksPerDay;
Console.WriteLine(days); // 输出：66</code>

Note:

DateTime Ticks No matter which method you choose, it must ensure that the date value is valid and represents the date in the Gaoli calendar. In addition, please consider the situation of the start date later than the end date.

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