首页String date = dsf.format(new Date());

String date = dsf.format(new Date());

时间: 2024-05-31 11:08:28 浏览: 93

This code creates a new instance of the Date class and formats it using the SimpleDateFormat object dsf. The resulting formatted string is stored in the variable date. The format of the date string depends on the pattern specified in the dsf object. For example, if dsf is set to "MM/dd/yyyy", the resulting date string might look like "10/31/2021".

SimpleDateFormat dsf = new SimpleDateFormat("yyyy-MM"); String date = dsf.format(new Date()); Calendar calendar = Calendar.getInstance();

This code creates a SimpleDateFormat object with the format "yyyy-MM", which represents the year and month in a specific pattern. It then formats the current date using this format and stores it in a String variable called "date". Finally, it creates a Calendar object and sets it to the current date and time using the getInstance() method.

string dsf = endDateTime.ToString("yyyy-MM-dd HH:00:00"); DateTime startDateTime = DateTime.Parse(dsf);怎么简写成一步

你可以使用`DateTime.TryParseExact`方法来进行一步操作，这个方法可以直接尝试解析字符串并返回`DateTime`对象，如果解析成功则返回`true`。这样简化后的代码如下： ```csharp DateTime? startDateTime = DateTime.TryParseExact(dsf, "yyyy-MM-dd HH:mm:ss", null, System.Globalization.DateTimeStyles.None, out DateTime parsedDateTime); if (startDateTime.HasValue) { startDateTime = parsedDateTime; } else { // 如果解析失败，这里可以添加错误处理或默认值逻辑 } ``` 在这个版本中，`TryParseExact`方法试图根据指定格式将字符串转换为`DateTime`。如果解析成功，结果被赋值给`parsedDateTime`，然后设置`startDateTime`。如果解析失败（`startDateTime.Value`为`null`），你需要额外处理这种情况。

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