将DateTime转换为长时间，也可以相反 [英] Convert DateTime to long and also the other way around

问题描述

我想将日期作为数字存储在表中。我知道如何做，但我不知道怎么回去。如何为ToDateTime投一个长变量。

I want to store dates as numbers in a table. I know how to do that but I don't know how to go back. How can I cast a long variable to ToDateTime.

DateTime now = DateTime.Now;
long t = now.ToFileTime();
DateTime today = t.ToDateTime;  // I am looking for something like this line. This Method does not exist

我知道有很多方法可以将DateTime转换为很长时间。我不介意使用哪种技术。我只想有一种可以来回转换的方法。

I know there are many ways of converting DateTime to long. I don't mind which technique to use. I just want to have a way where I can convert back and forth.

推荐答案

从DateTime开始：

To long from DateTime:

long DateTime.Ticks

从长的日期时间：

new DateTime（long）

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