calendar

How to convert time to ” time ago ” in android

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

How to save and retrieve Date in SharedPreferences

To save and load accurate date, you could use the long (number) representation of a Date object. Example: //getting the current time in milliseconds, and creating a Date object from it: Date date = new Date(System.currentTimeMillis()); //or simply new Date(); //converting it back to a milliseconds representation: long millis = date.getTime(); You can use this … Read more

How to get ics calendar invitation to automatically add to calendar

You need to consider three points in order to add events automatically: Email Header iCalendar Method ATTENDEE information the “VEVENT” calendar component Email Header In order to get the email client to parse correctly the attached .ics file, you should add the scheduling method and MIME information to the email headers. This is specified by … Read more

calculate business days including holidays

Since the accepted answer still uses the obsolete Calendar class – here’s my two cents using the newer Java Date and Time API available in the java.time package. You have to get the dates of the holidays from somewhere, there is no standard Java library for it. That would be too localized anyway, since holidays … Read more