比较Android中日期的最佳方式

Question

我试图将String格式的日期与当前日期进行比较.这是我做的方式(没有测试,但应该工作),但我使用弃用的方法.对替代方案有什么好的建议吗？谢谢.

PS我真的很讨厌用Java做Date的东西.有很多方法可以做同样的事情,你真的不确定哪一个是正确的,所以我的问题在这里.

String valid_until = "1/1/1990";

Calendar cal = Calendar.getInstance();
SimpleDateFormat sdf = new SimpleDateFormat("dd/mm/yyyy");
Date strDate = sdf.parse(valid_until);

int year = strDate.getYear(); // this is deprecated
int month = strDate.getMonth() // this is deprecated
int day = strDate.getDay(); // this is deprecated       

Calendar validDate = Calendar.getInstance();
validDate.set(year, month, day);

Calendar currentDate = Calendar.getInstance();

if (currentDate.after(validDate)) {
    catalog_outdated = 1;
}

Answer 1

您的代码可以缩减为

SimpleDateFormat sdf = new SimpleDateFormat("dd/MM/yyyy");
Date strDate = sdf.parse(valid_until);
if (new Date().after(strDate)) {
    catalog_outdated = 1;
}

要么

SimpleDateFormat sdf = new SimpleDateFormat("dd/MM/yyyy");
Date strDate = sdf.parse(valid_until);
if (System.currentTimeMillis() > strDate.getTime()) {
    catalog_outdated = 1;
}

Answer 2

你可以使用compareTo()

如果当前对象小于其他对象,则CompareTo方法必须返回负数,如果当前对象大于其他对象,则返回正数;如果两个对象彼此相等,则返回零.

// Get Current Date Time
Calendar c = Calendar.getInstance();
SimpleDateFormat sdf = new SimpleDateFormat("MM/dd/yyyy HH:mm aa");
String getCurrentDateTime = sdf.format(c.getTime());
String getMyTime="05/19/2016 09:45 PM ";
Log.d("getCurrentDateTime",getCurrentDateTime); 
// getCurrentDateTime: 05/23/2016 18:49 PM

if (getCurrentDateTime.compareTo(getMyTime) < 0)
{

}
else
{
 Log.d("Return","getMyTime older than getCurrentDateTime "); 
}

Answer 3

您可以直接创建Calendar一个Date:

Calendar validDate = new GregorianCalendar();
validDate.setTime(strDate);
if (Calendar.getInstance().after(validDate)) {
    catalog_outdated = 1;
}

Answer 4

请注意,在代码工作之前,正确的格式是("dd/MM/yyyy")."mm"意味着小吃!

String valid_until = "01/07/2013";
SimpleDateFormat sdf = new SimpleDateFormat("dd/MM/yyyy");
Date strDate = null;
try {
    strDate = sdf.parse(valid_until);
} catch (ParseException e) {
    e.printStackTrace();
}
if (new Date().after(strDate)) {
    catalog_outdated = 1;
}

Answer 5

Calendar toDayCalendar = Calendar.getInstance();
Date date1 = toDayCalendar.getTime();


Calendar tomorrowCalendar = Calendar.getInstance();
tomorrowCalendar.add(Calendar.DAY_OF_MONTH,1);
Date date2 = tomorrowCalendar.getTime();

// date1 is a present date and date2 is tomorrow date

if ( date1.compareTo(date2) < 0 ) {

  //  0 comes when two date are same,
  //  1 comes when date1 is higher then date2
  // -1 comes when date1 is lower then date2

 }

Answer 6

String date = "03/26/2012 11:00:00";
    String dateafter = "03/26/2012 11:59:00";
    SimpleDateFormat dateFormat = new SimpleDateFormat(
            "MM/dd/yyyy hh:mm:ss");
    Date convertedDate = new Date();
    Date convertedDate2 = new Date();
    try {
        convertedDate = dateFormat.parse(date);
        convertedDate2 = dateFormat.parse(dateafter);
        if (convertedDate2.after(convertedDate)) {
            txtView.setText("true");
        } else {
            txtView.setText("false");
        }
    } catch (ParseException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

它返回true ..并且您还可以在date.before和date.equal的帮助下检查before和equal。

Answer 7

将日期转换为日历并在那里进行计算。:)

Calendar cal = Calendar.getInstance();
cal.setTime(date);

int year = cal.get(Calendar.YEAR);
int month = cal.geT(Calendar.MONTH);
int day = cal.get(Calendar.DAY_OF_MONTH); //same as cal.get(Calendar.DATE)

或者：

SimpleDateFormat sdf = new SimpleDateFormat("dd/MM/yyyy");
Date strDate = sdf.parse(valid_until);

if (strDate.after(new Date()) {
    catalog_outdated = 1;
}

Answer 8

在 Kotlin 中，使用内置函数 after() 或 before() 来比较两个时间对象非常简单：

expirationTime.after(Date())