Here’s a two line solution: long msDiff = Calendar.getInstance().getTimeInMillis() – testCalendar.getTimeInMillis(); long daysDiff = TimeUnit.MILLISECONDS.toDays(msDiff); In this example it gets the number of days between date “testCalendar” and the current date.
tl;dr Use the modern java.time classes. ZonedDateTime.now( // Capture the current moment in the wall-clock time used by the people of a certain region (a time zone). ZoneId.systemDefault() // Get the JVM’s current default time zone. Can change at any moment during runtime. If important, confirm with the user. ) // Renders a `ZonedDateTime` object. … Read more
add() – almost always, as you said roll() – for example you want to “dispense” events in one month. The algorithm may be to proceed a number of days and place the event, then proceed further. When the end of the month is reached, it should start over from the beginning. Hence roll().
Use the dateFormat option $(function(){ $(“#to”).datepicker({ dateFormat: ‘yy-mm-dd’ }); $(“#from”).datepicker({ dateFormat: ‘yy-mm-dd’ }).bind(“change”,function(){ var minValue = $(this).val(); minValue = $.datepicker.parseDate(“yy-mm-dd”, minValue); minValue.setDate(minValue.getDate()+1); $(“#to”).datepicker( “option”, “minDate”, minValue ); }) }); Demo at http://jsfiddle.net/gaby/WArtA/
I have been struggling with the same problem, and I was actually toying with the “cache table” idea suggested above, but then I came across an alternative (suggested here) that doesn’t seem to have been represented yet. Build a table containing all events EventID (primary key) Description StartDate PeriodType – days, weeks, months, years PeriodFreq … Read more
You could use new GregorianCalendar(theYear, theMonth, theDay).getTime(): public GregorianCalendar(int year, int month, int dayOfMonth) Constructs a GregorianCalendar with the given date set in the default time zone with the default locale.
1 for month is February. The 30th of February is changed to 1st of March. You should set 0 for month. The best is to use the constant defined in Calendar: c1.set(2000, Calendar.JANUARY, 30);
I see mainly three ways: a) built-in options using SimpleDateFormat and DateUtils SimpleDateFormat sdf = new SimpleDateFormat(“yyyy-MM-dd’T’HH:mm:ss.SSS’Z'”); sdf.setTimeZone(TimeZone.getTimeZone(“GMT”)); try { long time = sdf.parse(“2016-01-24T16:00:00.000Z”).getTime(); long now = System.currentTimeMillis(); CharSequence ago = DateUtils.getRelativeTimeSpanString(time, now, DateUtils.MINUTE_IN_MILLIS); } catch (ParseException e) { e.printStackTrace(); } b) external library ocpsoft/PrettyTime (based on java.util.Date) Here you have to use SimpleDateFormat, too, … Read more
It’s pretty simple actually: // I’m assuming that 1391 is the year, 4 is the month and 7 is the day DateTime dt = new DateTime(1391, 4, 7, persianCalendar); // Now use DateTime, which is always in the Gregorian calendar When you call the DateTime constructor and pass in a Calendar, it converts it for … Read more
For better localization and language support, it is often convenient to use the ICU (International Components for Unicode) library from IBM. The APIs are similar to the standard Java APIs, but add additional support for localization and internationalization (e.g. time and calendar issues, sorting, formatting rules and a regex implementation with proper Unicode support). To … Read more