IOS distance now a few hours, minutes, days, weeks, months, years

    nsstring *distancetime = [self returnfromthetimeoftoday:@ " 2016-09-29 01:45:10 "]; #pragma  mark  default one minute has 60 seconds, 60 minutes an hour   24 hours a day, 7 days a week, one months 30 days, 12 months a year   Do not consider other such as common year February 28 days, leap month 29 days these conditions-  (nsstring *) Returnfromthetimeoftoday: (nsstring *) timestr{     //timeStr  string Format->2016-09-29 01:45:10    nsdateformatter * form = [[nsdateformatter alloc] init];    //Setting the time zone      form.locale = [nslocale localewithlocaleidentifier:@ "cn"];     form.dateformat = @ "Yyyy-mm-dd hh:mm:ss";    nsdate *date =  [form datefromstring:timestr];        //Get the current time difference      NSTimeInterval timeInterval = [date timeIntervalSinceNow];     timeinterval = -timeinterval;    //then the comparison of the time     if (timeinterval < 60)      {        return [nsstring stringwithformat:@ "just" ];    }    //min     nsinteger minute =  timeinterval / 60;    if (minute < 60)      {        return [nsstring stringwithformat:@ "%ld minutes ago", minute ];    }    nsinteger hours = minute / 60;     if (hours < 24)     {         return [nsstring stringwithformat:@ "%ld hours ago", hours];    }     nsinteger day = hours / 24;    nsinteger  month = day/30;    nsinteger year = month/12;    if (day <= &NBSP;1)     {        form.dateformat = @ "Hh:mm";        nsstring *oldtime = [form  stringfromdate:date];        return [nsstring  stringwithformat:@ "Yesterday  %@", Oldtime];    }    if (day < &NBSP;7)     {        return [NSString  stringwithformat:@ "%ld days Ago", Day];    }    if ((DAY/7) <4)      {        return [nsstring stringwithformat:@ "% LD weeks Ago ", Day/7];    }    else if (month < 12)      {        return [nsstring stringwithformat:@ "%ld months ago", month];    }     else    {         form.dateformat = @ "yyyy-mm-dd hh:mm";         return  [nsstring stringwithformat:@ "%ld years ago", Year];    }    return  nil;    }

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IOS distance now a few hours, minutes, days, weeks, months, years