C#日期格式问题

我有以下资料：

string QDI_DATE_FORMAT = "yyyy-MM-ddTHH:mm:00.0000000K";            

string from = "2016-06-20T16:20:00.0000000-04:00";
string to =   "2016-06-21T16:21:00.0000000-04:00";

DateTime fromDate = DateTime.ParseExact(from, QDI_DATE_FORMAT, CultureInfo.InvariantCulture, DateTimeStyles.None).Date;
DateTime toDate =   DateTime.ParseExact(to, QDI_DATE_FORMAT, CultureInfo.InvariantCulture, DateTimeStyles.None).Date;

Console.WriteLine(fromDate);
Console.WriteLine(toDate);

---

它打印出的日期没有小时和分钟。如何使其工作并显示时间？

您正在呼叫。仅选择日期部分的日期：

string from = "2016-06-20T16:20:00.0000000-04:00";
DateTime fromDateTime = DateTime.ParseExact(from, QDI_DATE_FORMAT, CultureInfo.InvariantCulture, DateTimeStyles.None);
DateTime toDateTime =   DateTime.ParseExact(to, QDI_DATE_FORMAT, CultureInfo.InvariantCulture, DateTimeStyles.None);

将产生：

> 6/20/2016 8:20:00 PM 
> 6/21/2016 8:21:00 PM

---

请注意，您正在调用的.Date末尾缺少.Date，它只选择了日期部分：

string from = "2016-06-20T16:20:00.0000000-04:00";
DateTime fromDateTime = DateTime.ParseExact(from, QDI_DATE_FORMAT, CultureInfo.InvariantCulture, DateTimeStyles.None);
DateTime toDateTime =   DateTime.ParseExact(to, QDI_DATE_FORMAT, CultureInfo.InvariantCulture, DateTimeStyles.None);

将产生：

> 6/20/2016 8:20:00 PM 
> 6/21/2016 8:21:00 PM

---

请注意末尾缺少.Date

，使用

.Date

只能从结果DateTime对象中选择日期部分。因此将应用时间的默认值，删除

.Date

，然后您将获得预期结果

DateTime fromDate = DateTime.ParseExact(from, QDI_DATE_FORMAT, CultureInfo.InvariantCulture, DateTimeStyles.None);
DateTime toDate =   DateTime.ParseExact(to, QDI_DATE_FORMAT, CultureInfo.InvariantCulture, DateTimeStyles.None);

---

这将通过使用

.Date

向您显示差异，您仅从结果DateTime对象中选择日期部分。因此将应用时间的默认值，删除

.Date

，然后您将获得预期结果

DateTime fromDate = DateTime.ParseExact(from, QDI_DATE_FORMAT, CultureInfo.InvariantCulture, DateTimeStyles.None);
DateTime toDate =   DateTime.ParseExact(to, QDI_DATE_FORMAT, CultureInfo.InvariantCulture, DateTimeStyles.None);

---

这将向您显示差异

只需从代码中删除结尾“.Date”

string QDI_DATE_FORMAT = "yyyy-MM-ddTHH:mm:00.0000000K";

string from = "2016-06-20T16:20:00.0000000-04:00";
string to = "2016-06-21T16:21:00.0000000-04:00";

DateTime fromDate = DateTime.ParseExact(from, QDI_DATE_FORMAT, CultureInfo.InvariantCulture, DateTimeStyles.None);
DateTime toDate = DateTime.ParseExact(to, QDI_DATE_FORMAT, CultureInfo.InvariantCulture, DateTimeStyles.None);

Console.WriteLine(fromDate);
Console.WriteLine(toDate);

Console.ReadLine();

---

你要做的只是从代码中删除你的结尾“.Date”

string QDI_DATE_FORMAT = "yyyy-MM-ddTHH:mm:00.0000000K";

string from = "2016-06-20T16:20:00.0000000-04:00";
string to = "2016-06-21T16:21:00.0000000-04:00";

DateTime fromDate = DateTime.ParseExact(from, QDI_DATE_FORMAT, CultureInfo.InvariantCulture, DateTimeStyles.None);
DateTime toDate = DateTime.ParseExact(to, QDI_DATE_FORMAT, CultureInfo.InvariantCulture, DateTimeStyles.None);

Console.WriteLine(fromDate);
Console.WriteLine(toDate);

Console.ReadLine();