Hello everyone, I was able to modify Activity Starter (as a new extension call Xactivity Starter) to allow setting beginTime and endTime of an event into Android calendar. The change to code source was trivial : if (key.length() != 0 && value.length() != 0) { Log.i("ActivityStarter", "Adding extra (pairs), key = " + key + " value = " + value); if (key.startsWith("B.")) { key = key.substring(2); intent.putExtra(key, Byte.parseByte(value)); }; if (key.startsWith("l.")) { key = key.substring(2); intent.putExtra(key, Long.parseLong(value));} else intent.putExtra(key, value); } } return intent; } Any key starting with "B." or "l." will be passed as boolean or long respectively. Example of use : Enjoy !