Date and time conversion

问题

I am working on a news app and I get the date and time from the json response in this pattern (2017-09-23T14:22:28Z).

How can I convert this date and time into something like that (5 seconds ago, 10 minutes ago, 3 hours ago, etc)? And after 24 hours past, it should then display the normal date of that particular news headline (2017-09-23).

回答1:

You can use this code which I have implemented in my chatting app.

public class Utils
{
    private static final int SECOND_MILLIS = 1000;
    private static final int MINUTE_MILLIS = 60 * SECOND_MILLIS;
    private static final int HOUR_MILLIS = 60 * MINUTE_MILLIS;
    private static final int DAY_MILLIS = 24 * HOUR_MILLIS;


    public static String getTimeAgo(long time, Context ctx) {
        if (time < 1000000000000L) {
            // if timestamp given in seconds, convert to millis
            time *= 1000;
        }

        long now = getCurrentTime(ctx);
        if (time > now || time <= 0) {
            return null;
        }

        // TODO: localize
        final long diff = now - time;
        if (diff < MINUTE_MILLIS) {
            return "just now";
        } else if (diff < 2 * MINUTE_MILLIS) {
            return "a minute ago";
        } else if (diff < 50 * MINUTE_MILLIS) {
            return diff / MINUTE_MILLIS + " minutes ago";
        } else if (diff < 90 * MINUTE_MILLIS) {
            return "an hour ago";
        } else if (diff < 24 * HOUR_MILLIS) {
            return diff / HOUR_MILLIS + " hours ago";
        } else if (diff < 48 * HOUR_MILLIS) {
            return "yesterday";
        } else {
            return diff / DAY_MILLIS + " days ago";
        }
    }
}

There as lot's of 3rd party libraries but you can also refer: https://github.com/curioustechizen/android-ago

回答2:

You may consider using JodaTime Library to manage all Date, Time and Calendar! Here is some code from Joda Time.

    public boolean isAfterPayDay(DateTime datetime) {
      if (datetime.getMonthOfYear() == 2) {   // February is month 2!!
      return datetime.getDayOfMonth() > 26;
   }
   return datetime.getDayOfMonth() > 28;
   }

   public Days daysToNewYear(LocalDate fromDate) {
       LocalDate newYear = fromDate.plusYears(1).withDayOfYear(1);
       return Days.daysBetween(fromDate, newYear);
   }

   public boolean isRentalOverdue(DateTime datetimeRented) {
      Period rentalPeriod = new Period().withDays(2).withHours(12);
      return datetimeRented.plus(rentalPeriod).isBeforeNow();
   }

   public String getBirthMonthText(LocalDate dateOfBirth) {
      return dateOfBirth.monthOfYear().getAsText(Locale.ENGLISH);
   }

Check the library Android Specific or Java Specific and its documentation HERE

回答3:

SimpleDateFormat simpledateformat = new SimpleDateFormat("yyyy-MM-dd'T'hh:mm:ss");
Date stringDate = simpledateformat.parse(aDate, 0);
DateUtils.getRelativeDateTimeString( this,d.getTime(), DateUtils.MINUTE_IN_MILLIS)

回答4:

Joda-Time is pretty nice for this.

compile 'joda-time:joda-time:2.9.9'

String dateTime = "2017-09-21T14:22:28Z";
    DateTimeFormatter format = DateTimeFormat.forPattern("yyyy-MM-dd'T'HH:mm:ssZ");
    DateTime myBirthDate = format.parseDateTime(dateTime);
    DateTime now = new DateTime();
    Period period = new Period(myBirthDate, now);
    PeriodFormatter formatter = new PeriodFormatterBuilder()
            .appendSeconds().appendSuffix(" Sekonds ago\n")
            .appendMinutes().appendSuffix(" Minutes ago\n")
            .appendHours().appendSuffix(" Hours ago\n")
            .appendDays().appendSuffix(" Days ago\n")
            .appendWeeks().appendSuffix(" Weeks ago\n")
            .appendMonths().appendSuffix(" Months ago\n")
            .appendYears().appendSuffix(" Years ago\n")
            .printZeroNever()
            .toFormatter();
    if (period.getDays()<1) {
        String result = formatter.print(period);
        System.out.println(result);
    } else {
        DateTimeFormatter format24hMore = DateTimeFormat.forPattern("yyyy-MM-dd");
        String result = format24hMore.print(myBirthDate);
        System.out.println(result);
    }

EDIT Create Method

public String convertDate(String date) {

    String result = "";
    DateTimeFormatter format = DateTimeFormat.forPattern("yyyy-MM-dd'T'HH:mm:ssZ");
    DateTime from = format.parseDateTime(date);
    DateTime now = new DateTime();
    Period period = new Period(from, now);
    PeriodFormatter formatter = new PeriodFormatterBuilder()
            .appendSeconds().appendSuffix(" Sekonds ago\n")
            .appendMinutes().appendSuffix(" Minutes ago\n")
            .appendHours().appendSuffix(" Hours ago\n")
            .appendDays().appendSuffix(" Days ago\n")
            .appendWeeks().appendSuffix(" Weeks ago\n")
            .appendMonths().appendSuffix(" Months ago\n")
            .appendYears().appendSuffix(" Years ago\n")
            .printZeroNever()
            .toFormatter();
    if (period.getDays()<1) {
        result = formatter.print(period);
    } else {
        DateTimeFormatter format24hMore = DateTimeFormat.forPattern("yyyy-MM-dd");
        result = format24hMore.print(from);

    }
    return result;
}

and you can call this Method

System.out.println(convertDate("2017-09-21T14:22:28Z"));

来源：https://stackoverflow.com/questions/46384332/date-and-time-conversion