How to get all dates between two dates in Android.
For example. I have two Strings.
String first="2012-07-15";
String second="2012-07-21";
I convert and get dates from these strings.
DateFormat df1 = new SimpleDateFormat("yyyy-MM-dd");
DateFormat df2 = new SimpleDateFormat("MMM dd");
String mydate = df2.format(df1.parse(first));
This way I get both dates from first and second String.
Now I also display all dates between these two dates.
it is better not to use any hardcoded values in date calculations. we can rely on java Calendar class methods to do this task
see the code
private static List<Date> getDates(String dateString1, String dateString2)
{
ArrayList<Date> dates = new ArrayList<Date>();
DateFormat df1 = new SimpleDateFormat("yyyy-MM-dd");
Date date1 = null;
Date date2 = null;
try {
date1 = df1 .parse(dateString1);
date2 = df1 .parse(dateString2);
} catch (ParseException e) {
e.printStackTrace();
}
Calendar cal1 = Calendar.getInstance();
cal1.setTime(date1);
Calendar cal2 = Calendar.getInstance();
cal2.setTime(date2);
while(!cal1.after(cal2))
{
dates.add(cal1.getTime());
cal1.add(Calendar.DATE, 1);
}
return dates;
}
and use it as below
List<Date> dates = getDates("2012-02-01", "2012-03-01");
for(Date date:dates)
System.out.println(date);
public class DummyWorks extends Activity
{
static final long ONE_DAY = 24 * 60 * 60 * 1000L;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
getDatesBetween("03/23/2011","03/28/2011");
}
public static void getDatesBetween(String startDate,String endDate) {
long from=Date.parse(startDate);
long to=Date.parse(endDate);
int x=0;
while(from <= to) {
x=x+1;
System.out.println ("Dates : "+new Date(from));
from += ONE_DAY;
}
System.out.println ("No of Dates :"+ x);
}
}
Solution in Kotlin: It will return List of Date between 2 dates.
fun getDatesBetween(dateString1:String, dateString2:String):List<String> {
val dates = ArrayList<String>()
val input = SimpleDateFormat("yyyy-MM-dd", Locale.getDefault())
var date1:Date? = null
var date2:Date? = null
try
{
date1 = input.parse(dateString1)
date2 = input.parse(dateString2)
}
catch (e:ParseException) {
e.printStackTrace()
}
val cal1 = Calendar.getInstance()
cal1.time = date1
val cal2 = Calendar.getInstance()
cal2.time = date2
while (!cal1.after(cal2))
{
val output = SimpleDateFormat("yyyy-MM-dd", Locale.getDefault())
dates.add(output.format(cal1.time))
cal1.add(Calendar.DATE, 1)
}
return dates
}
Consider using java.time, the modern Java date and time API, for your date work. LocalDate is the class to use for a date (without time of day). I was assuming you wanted all the dates inclusive of the two given ones.
String first = "2012-07-15";
String second = "2012-07-21";
List<LocalDate> dates = LocalDate.parse(first)
.datesUntil(LocalDate.parse(second).plusDays(1))
.collect(Collectors.toList());
System.out.println(dates);
Output:
[2012-07-15, 2012-07-16, 2012-07-17, 2012-07-18, 2012-07-19, 2012-07-20, 2012-07-21]
LocalDate.datesUntil() gives us a stream of dates exclusive of the specified end date, so we need to add one day to it to have it included.
I am exploiting the fact that your strings are in ISO 8601 format and that LocalDate parses this format as its default, that is, without any explicit formatter.
If for some reason you are using the ThreeTenABP library rather than desugaring, I believe that the datesUntil method is not there. In this case use a loop instead.
List<LocalDate> dates = new ArrayList<>();
LocalDate currentDate = LocalDate.parse(first);
LocalDate lastDate = LocalDate.parse(second);
while (! currentDate.isAfter(lastDate )) {
dates.add(currentDate);
currentDate = currentDate.plusDays(1);
}
[2012-07-15, 2012-07-16, 2012-07-17, 2012-07-18, 2012-07-19, 2012-07-20, 2012-07-21]
java.time works nicely on both older and newer Android devices. It just requires at least Java 6.
org.threeten.bp with subpackages.java.time was first described.java.time to Java 6 and 7 (ThreeTen for JSR-310).
val currentDateCalendar = Calendar.getInstance()
val mCurrentDate = getDateChanger(currentDateCalendar.time, "yyyy-MM-dd")
currentDateCalendar.add(Calendar.MONTH, 1)
val oneMonthNextCalendar = currentDateCalendar
val mNextDate = getDateChanger(oneMonthNextCalendar.time, "yyyy-MM-dd")
val mDates = datesBetween(
mCurrentDate,
mNextDate,
"yyyy-MM-dd"
)
for (date in mDates)
Log.i("DatesBetween",date)
@SuppressLint("SimpleDateFormat")
fun getDateChanger(mDate:Date,formatter: String): String {
val dateFormat = SimpleDateFormat(formatter)
return dateFormat.format(mDate)
}
@SuppressLint("SimpleDateFormat")
fun datesBetween(startDate: String, endDate: String,formatter: String): List<String> {
val dates = ArrayList<String>()
val dateFormat: DateFormat = SimpleDateFormat(formatter)
var sDate: Date? = null
var eDate: Date? = null
try {
sDate = dateFormat.parse(startDate)
eDate = dateFormat.parse(endDate)
} catch (e: ParseException) {
e.printStackTrace()
}
val sCalendarDate = Calendar.getInstance()
sCalendarDate.time = sDate!!
val eCalendarDate = Calendar.getInstance()
eCalendarDate.time = eDate!!
while (!sCalendarDate.after(eCalendarDate)) {
dates.add(dateFormat.format(sCalendarDate.time))
sCalendarDate.add(Calendar.DATE, 1)
}
return dates
}
