iOS根据所得到的开始时间计算结束的时间

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/** *  @author cjh, 15-08-06 16:08:40 * *  获取预约时间label的text,超过当天的显示yyyy.mm.dd HH:mm - yyyy.mm.dd HH:mm * *  @parma projectStartTime:项目开始时间 *  @parma totalTIme:项目总时长 *  @return 时间内容 */+(NSString *)_getProjectTimeLableText:(NSString *)projectStartTime withTotalTime:(int)totalTime{    //格式化时间    NSDateFormatter *fomatter = [[NSDateFormatter alloc] init];    [fomatter setDateFormat:@"YYYY.MM.dd HH:mm"];    NSDate *bookingDate = [fomatter dateFromString:projectStartTime];        NSString *endDateStr = [Tool convertTimeMs:bookingDate withIntervalHour:totalTime];    NSString *startDateStr = [fomatter stringFromDate:bookingDate];        //开始、结束时间    NSDate *startDate = [fomatter dateFromString:projectStartTime];    NSDate *endDate = [fomatter dateFromString:endDateStr];        //计算两个时间之间年、月、日相隔的数，用来判断页面中的时间如何显示    NSInteger apartDay =[endDate getDay] - [startDate getDay];    NSInteger apartMonth = [endDate getMonth] - [startDate getMonth];    NSInteger apartYear = [endDate getYear] - [startDate getYear];    NSString *projectTimeLabelText= @"";             //跨月    if(apartDay != 0 || apartMonth != 0)    {        //跨年        if(apartYear != 0)        {            projectTimeLabelText = [NSString stringWithFormat:@"%@ - %@",[projectStartTime stringByReplacingOccurrencesOfString:@"-" withString:@"."],endDateStr];        }        //跨月后天        else        {            projectTimeLabelText = [NSString stringWithFormat:@"%@ - %02ld.%02ld %02d:%02d",startDateStr,(long)[endDate getMonth],(long)[endDate getDay],[endDate getHour],[endDate getMinute]];        }    }    //跨时    else    {        projectTimeLabelText = [NSString stringWithFormat:@"%@-%02d:%02d",startDateStr,[endDate getHour],[endDate getMinute]];    }    return projectTimeLabelText;}
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