如何在android中添加日期到日期

In my database I am getting start date like 2011-11-30(yyyy/mm/dd)format.and duration date like 40 days.How can i calculate the days and get new date format of mm/dd/yyyy.

在我的数据库中,我的开始日期如2011-11-30(yyyy / mm / dd)格式。持续日期为40天。如何计算天数并获得mm / dd / yyyy的新日期格式。

Can anyone help me

谁能帮我

Thanks

8 个解决方案

#1

You can try something like this,

你可以尝试这样的事情,

String dt = "2012-01-04";  // Start date
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
Calendar c = Calendar.getInstance();
try {
    c.setTime(sdf.parse(dt));
} catch (ParseException e) {
    e.printStackTrace();
}
c.add(Calendar.DATE, 40);  // number of days to add, can also use Calendar.DAY_OF_MONTH in place of Calendar.DATE
SimpleDateFormat sdf1 = new SimpleDateFormat("MM-dd-yyyy");
String output = sdf1.format(c.getTime());

#2

Step-1 Get Calendar instance from the specified string

步骤1从指定的字符串中获取Calendar实例

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
            Calendar c = Calendar.getInstance();
            c.setTime(sdf.parse(dateInString));

Step-2 use add() to add number of days to calendar

步骤2使用add()向日历添加天数

c.add(Calendar.DATE, 40);

Step-3 Convert the dtae to the resultant date format

步骤3将dtae转换为结果日期格式

sdf = new SimpleDateFormat("MM/dd/yyyy");
            Date resultdate = new Date(c.getTimeInMillis());
            dateInString = sdf.format(resultdate);

Source Code

String dateInString = "2011-11-30";  // Start date
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
        Calendar c = Calendar.getInstance();
        c.setTime(sdf.parse(dateInString));
        c.add(Calendar.DATE, 40);  
        sdf = new SimpleDateFormat("MM/dd/yyyy");
        Date resultdate = new Date(c.getTimeInMillis());
        dateInString = sdf.format(resultdate);
        System.out.println("String date:"+dateInString);

#3

Date dtStartDate=o.getStartDate();
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm");
Calendar c = Calendar.getInstance();
c.setTime(dtStartDate);
c.add(Calendar.DATE, 3);  // number of days to add
String dt = sdf.format(c.getTime());  // dt is now the new date
Toast.makeText(this, "" + dt, 5000).show();

#4

This code is working 100%

此代码100%正常工作

            Calendar c = Calendar.getInstance();
            SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd");// HH:mm:ss");
            String reg_date = df.format(c.getTime());
            showtoast("Currrent Date Time : "+reg_date);

            c.add(Calendar.DATE, 3);  // number of days to add
            String end_date = df.format(c.getTime());
            showtoast("end Time : "+end_date);

#5

Calendar c = Calendar.getInstance();
    int mYear = c.get(Calendar.YEAR);
    int mMonth = c.get(Calendar.MONTH);
    int mDay = c.get(Calendar.DAY_OF_MONTH);

    // display the current date
    String CurrentDate = mYear + "/" + mMonth + "/" + mDay;

    String dateInString = CurrentDate; // Start date
    SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");

    c = Calendar.getInstance();

    try {
        c.setTime(sdf.parse(dateInString));
    } catch (ParseException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

    c.add(Calendar.DATE, 7656);//insert the number of days you want to be added to the current date
    sdf = new SimpleDateFormat("dd/MM/yyyy");
    Date resultdate = new Date(c.getTimeInMillis());
    dateInString = sdf.format(resultdate);

    //Display the Result in the Edit Text or Text View your Choice
    EditText etDOR = (EditText)findViewById(R.id.etDateOfReturn);
    etDOR.setText(dateInString);

#6

Just Simple copy this method pass data

只需简单复制此方法传递数据

public static String ConvertToDate(String dateString,String inputFormater ,String outputFormater) {
        String outputText = "" ;
        try {
            SimpleDateFormat inputFormat = new SimpleDateFormat(inputFormater);
            SimpleDateFormat outputFormat = new SimpleDateFormat(outputFormater);
            Date parsed = null;
            parsed = inputFormat.parse(dateString);
            outputText = outputFormat.format(parsed);

        Log.d(TAG, "  msg : " + outputText);
        } catch (ParseException e) {
            e.printStackTrace();
            Log.e(TAG, "ERROR : " + e.getMessage());
        }
        return outputText;
    }

And call it like

并称之为

 public static String INPUTE_JSON_DATE_FORMAT = "yyyy-MM-dd HH:mm:ss";
 public static String FORMAT_FOR_JOB_APPLIED = "MMM dd, yyyy";
 String date ="2017-10-29";
 ConvertToDate(date ,DateUtils.INPUTE_JSON_DATE_FORMAT ,DateUtils.FORMAT_FOR_JOB_APPLIED);

You can put any format you want in your cituation

你可以在你的cituation中放置你想要的任何格式

ConvertToDate("2011-11-30","yyyy/mm/dd" ,"mm/dd/yyyy");

#7

It works for me.

这个对我有用。

Calendar c = Calendar.getInstance();
int mYear = c.get(Calendar.YEAR);
int mMonth = c.get(Calendar.MONTH);
int mDay = c.get(Calendar.DAY_OF_MONTH);

String CurrentDate = mYear + "/" + mMonth + "/" + mDay;
String dateInString = dob; // Select date
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
c = Calendar.getInstance();
try {
c.setTime(sdf.parse(dateInString));
} catch (ParseException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
c.add(Calendar.DATE, 14);    //14 dats add
sdf = new SimpleDateFormat("dd/MM/yyyy");
Date resultdate = new Date(c.getTimeInMillis());
dateInString = sdf.format(resultdate);
System.out.println(dateInString);

#8

This piece of code should do the job well!!!

这段代码应该可以很好地完成工作!

public static Date addDay(Date oldDate, int numberOfDays) {
    SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
    Calendar c = Calendar.getInstance();
    try {
        c.setTime(dateFormat.parse(oldDate));
    } catch (ParseException e) {
        e.printStackTrace();
    }
    c.add(Calendar.DAY_OF_YEAR,numberOfDays);
    dateFormat=new SimpleDateFormat("MM-dd-YYYY");
    Date newDate=new Date(c.getTimeInMillis());
    String resultDate=dateFormat.format(newDate);
}

For more functionality do please checkout this link
Add days,months,years to a date

有关更多功能,请查看此链接将日期,月份,年份添加到日期

#1