Android两天之间的天数 [英] Android Days between two dates

问题描述

我想比较Android应用程式的两个日期，但我有一个很奇怪的问题。

例如：

如果我将在过去日期设置为127天前：

  this.dateEvent = System.currentTimeMillis（） - （127 * 24 * 3600 * 1000）
  

$ b b

然后将其与当前日期（天之间）进行比较

 日历sDate = getDatePart dateEvent））; 
 Calendar eDate = getDatePart（new Date（System.currentTimeMillis（）））; 
 
 int daysBetween = 0; 
 while（sDate.before（eDate））
 {
 sDate.add（Calendar.DAY_OF_MONTH，1）; 
天Between++; 
} 
 
 while（sDate.after（eDate））
 {
 eDate.add（Calendar.DAY_OF_MONTH，1）; 
天Between++; 
} 
 
 return daysBetween; 
  

它将返回22，这根本不是预期的。

我做错了或者是日历类的问题？

  public String get_count_of_days（String Created_date_String ，String Expire_date_String）{
 SimpleDateFormat dateFormat = new SimpleDateFormat（dd / MM / yyyy，Locale.getDefault（））; 
 
 Date Created_convertedDate = null，Expire_CovertedDate = null，todayWithZeroTime = null; 
 try {
 Created_convertedDate = dateFormat.parse（Created_date_String）; 
 Expire_CovertedDate = dateFormat.parse（Expire_date_String）; 
 
今天日期= new Date（）; 
 
 todayWithZeroTime = dateFormat.parse（dateFormat.format（today））; 
} catch（ParseException e）{
 e.printStackTrace（）; 
} 
 
 int c_year = 0，c_month = 0，c_day = 0; 
 
 if（Created_convertedDate.after（todayWithZeroTime））{
 Calendar c_cal = Calendar.getInstance（）; 
 c_cal.setTime（Created_convertedDate）; 
 c_year = c_cal.get（Calendar.YEAR）; 
 c_month = c_cal.get（Calendar.MONTH）; 
 c_day = c_cal.get（Calendar.DAY_OF_MONTH）; 
 
} else {
 Calendar c_cal = Calendar.getInstance（）; 
 c_cal.setTime（todayWithZeroTime）; 
 c_year = c_cal.get（Calendar.YEAR）; 
 c_month = c_cal.get（Calendar.MONTH）; 
 c_day = c_cal.get（Calendar.DAY_OF_MONTH）; 
} 
 
 
 / * Calendar today_cal = Calendar.getInstance（）; 
 int today_year = today_cal.get（Calendar.YEAR）; 
 int today = today_cal.get（Calendar.MONTH）; 
 int today_day = today_cal.get（Calendar.DAY_OF_MONTH）; 
 * / 
 
日历e_cal = Calendar.getInstance（）; 
 e_cal.setTime（Expire_CovertedDate）; 
 
 int e_Year = e_cal.get（Calendar.YEAR）; 
 int e_month = e_cal.get（Calendar.MONTH）; 
 int e_day = e_cal.get（Calendar.DAY_OF_MONTH）; 
 
日历date1 = Calendar.getInstance（）; 
日历date2 = Calendar.getInstance（）; 
 
 date1.clear（）; 
 date1.set（c_year，c_month，c_day）; 
 date2.clear（）; 
 date2.set（e_year，e_month，e_day）; 
 
 long diff = date2.getTimeInMillis（） -  date1.getTimeInMillis（）; 
 
 float dayCount =（float）diff /（24 * 60 * 60 * 1000）; 
 
 return（+（int）dayCount +Days）; 
} 
  

I want to compare two dates for my Android application, but I got a really weird issue.

For example:

If I set the back in the past date to 127 days ago:

this.dateEvent = System.currentTimeMillis() - (127 * 24 * 3600 * 1000)

And then compare it to the current date (Days between)

    Calendar sDate = getDatePart(new Date(this.dateEvent));
    Calendar eDate = getDatePart(new Date(System.currentTimeMillis()));

    int daysBetween = 0;
    while (sDate.before(eDate))
    {
        sDate.add(Calendar.DAY_OF_MONTH, 1);
        daysBetween ++;
    }

    while (sDate.after(eDate))
    {
        eDate.add(Calendar.DAY_OF_MONTH, 1);
        daysBetween ++;
    }

    return daysBetween;

It will return 22 which is not at all what was expected.

Did I make something wrong or is that an issue with the Calendar class ?

解决方案

Please refer this code, this may help you.

public String get_count_of_days(String Created_date_String, String Expire_date_String) {
    SimpleDateFormat dateFormat = new SimpleDateFormat("dd/MM/yyyy", Locale.getDefault());

    Date Created_convertedDate = null, Expire_CovertedDate = null, todayWithZeroTime = null;
    try {
        Created_convertedDate = dateFormat.parse(Created_date_String);
        Expire_CovertedDate = dateFormat.parse(Expire_date_String);

        Date today = new Date();

        todayWithZeroTime = dateFormat.parse(dateFormat.format(today));
    } catch (ParseException e) {
        e.printStackTrace();
    }

    int c_year = 0, c_month = 0, c_day = 0;

    if (Created_convertedDate.after(todayWithZeroTime)) {
        Calendar c_cal = Calendar.getInstance();
        c_cal.setTime(Created_convertedDate);
        c_year = c_cal.get(Calendar.YEAR);
        c_month = c_cal.get(Calendar.MONTH);
        c_day = c_cal.get(Calendar.DAY_OF_MONTH);

    } else {
        Calendar c_cal = Calendar.getInstance();
        c_cal.setTime(todayWithZeroTime);
        c_year = c_cal.get(Calendar.YEAR);
        c_month = c_cal.get(Calendar.MONTH);
        c_day = c_cal.get(Calendar.DAY_OF_MONTH);
    }


    /*Calendar today_cal = Calendar.getInstance();
    int today_year = today_cal.get(Calendar.YEAR);
    int today = today_cal.get(Calendar.MONTH);
    int today_day = today_cal.get(Calendar.DAY_OF_MONTH);
    */

    Calendar e_cal = Calendar.getInstance();
    e_cal.setTime(Expire_CovertedDate);

    int e_year = e_cal.get(Calendar.YEAR);
    int e_month = e_cal.get(Calendar.MONTH);
    int e_day = e_cal.get(Calendar.DAY_OF_MONTH);

    Calendar date1 = Calendar.getInstance();
    Calendar date2 = Calendar.getInstance();

    date1.clear();
    date1.set(c_year, c_month, c_day);
    date2.clear();
    date2.set(e_year, e_month, e_day);

    long diff = date2.getTimeInMillis() - date1.getTimeInMillis();

    float dayCount = (float) diff / (24 * 60 * 60 * 1000);

    return ("" + (int) dayCount + " Days");
}

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