解决方案（ThreeTen-Backport库）：
运行良好，我已经在KitKat模拟器上进行了尝试。
private static final ChronoUnit[] chronoUnits = {ChronoUnit.YEARS, ChronoUnit.MONTHS, ChronoUnit.DAYS, ChronoUnit.HOURS, ChronoUnit.MINUTES, ChronoUnit.SECONDS};private static final Map<ChronoUnit, Integer> chronoUnitPluralIdMap = new HashMap<ChronoUnit, Integer>() {{ put(ChronoUnit.YEARS, R.plurals.chrono_unit_years_ago); put(ChronoUnit.MONTHS, R.plurals.chrono_unit_months_ago); put(ChronoUnit.DAYS, R.plurals.chrono_unit_days_ago); put(ChronoUnit.HOURS, R.plurals.chrono_unit_hours_ago); put(ChronoUnit.MINUTES, R.plurals.chrono_unit_minutes_ago); put(ChronoUnit.SECONDS, R.plurals.chrono_unit_seconds_ago);}};public static String getTimeStringUntilNowFromUTC(Context context, String utcDate) { Instant now = Instant.now(Clock.systemUTC()); Instant then = Instant.parse(utcDate); for (ChronoUnit chronoUnit : chronoUnits) { if (then.isSupported(chronoUnit)) { long units = chronoUnit.between(then, now); if (units > 0) { //noinspection ConstantConditions return context.getResources().getQuantityString(chronoUnitPluralIdMap.get(chronoUnit), (int)units, (int)units); } } } return "-";}public static String getTimeBetweenTwoDates(Context context, String date1, String date2) { Instant date1Instant = Instant.parse(date1); Instant date2Instant = Instant.parse(date2); final long seconds = ChronoUnit.SECONDS.between(date1Instant, date2Instant); return getMinutesSecondsString(context, seconds);}
