java java获取当前计算机的日期

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java get the current computer's date

java

提问by Totti

how can i get computer's date on java, i want just year, month, day i tried to get calender like this

我如何在 Java 上获取计算机的日期,我只想要年、月、日我试图像这样获取日历

Calendar c =Calendar.getInstance();
        c.clear(Calendar.HOUR)

but can't know to deal with it,

但不知道如何处理,

回答by 11684

First link on google:

谷歌上的第一个链接:

import java.util.Date;
import java.text.DateFormat;
import java.text.SimpleDateFormat;

private String getDateTime() {
        DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
        Date date = new Date();
        return dateFormat.format(date);
    }

回答by Kumar Vivek Mitra

Try this ONE line of code.....

试试这一行代码.....

// Prints 01-07-2012

// 打印 01-07-2012

 System.out.println(new SimpleDateFormat("dd-MM-YYYY").format(new Date())); 

// Prints 01-Jul-2012

// 打印 01-Jul-2012

System.out.println(new SimpleDateFormat("dd-MMM-YYYY").format(new Date()));

回答by óscar López

You can obtain the current date as a year/month/daystring like this:

您可以year/month/day像这样获取当前日期作为字符串:

String strDate = new SimpleDateFormat("yyyy-MM-dd").format(new Date());
System.out.println(strDate);
> 2012-07-01

Notice that a Dateobject will alwayscontain year, month, day, hours, minutes, seconds, milliseconds, etc., and by calling new Date()you obtain a date object with the current time.

请注意,Date对象将始终包含年、月、日、小时、分钟、秒、毫秒等,通过调用new Date()您可以获得具有当前时间的日期对象。

If you only need some fields of a date (say, year, month and day) you need to format the date using a formatter, for instance SimpleDateFormat. Check the link for learning more about the string formatting options available in Java.

如果您只需要日期的某些字段(例如,年、月和日),您需要使用格式化程序格式化日期,例如SimpleDateFormat。查看链接以了解有关 Java 中可用字符串格式选项的更多信息。

回答by Michael Besteck

    Calendar rightNow = Calendar.getInstance();
    int y = rightNow.get(Calendar.YEAR);
    int m = rightNow.get(Calendar.MONTH) + 1;
    int d = rightNow.get(Calendar.DAY_OF_MONTH);
    System.out.println("year "+y+"  month "+m+"  day "+d);

回答by Basil Bourque

Joda-Time

乔达时间

Some example code using the Joda-Time2.4 library.

使用Joda-Time2.4 库的一些示例代码。

The java.util.Date and .Calendar classes are notoriously troublesome. Avoid them. Use either Joda-Time or the new java.time package in Java 8 (inspired by Joda-Time, defined by JSR 310).

java.util.Date 和 .Calendar 类是出了名的麻烦。避开它们。使用 Joda-Time 或 Java 8 中的新 java.time 包(受 JSR 310 定义的 Joda-Time 启发)。

Time Zone

时区

Note the use of a time zone. A time zone is necessary to determine a date. The same simultaneous moment in Kolkata and Paris may have different dates on the calendar. If you omit a time zone, the JVM's current default time zone will be applied. That means your results may vary, so best to explicitly specify the time zone you intend.

请注意时区的使用。需要时区来确定日期。加尔各答和巴黎的同一时刻在日历上可能有不同的日期。如果省略时区,则将应用 JVM 当前的默认时区。这意味着您的结果可能会有所不同,因此最好明确指定您想要的时区。

Example Code

示例代码

String output = LocalDate.now( TimeZone.forID( "Asia/Kolkata" ) ).toString();