日期间隔

根据指定日期与现在日期时间对比相差几周几月

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#define knewsTimeFormat @"yyyyMMddHHmmss" //你要传过来日期的格式 #define kLocaleIdentifier @"en_US"   // 发布时间 - (NSString *)newsTime:(NSString *)newsTimes {     NSDateFormatter *formatter = [[NSDateFormatter alloc] init];     formatter.dateFormat = knewsTimeFormat;     formatter.locale = [[NSLocale alloc] initWithLocaleIdentifier:kLocaleIdentifier];           NSDate *date = [formatter dateFromString:newsTimes];           NSDate *now = [NSDate date];           // 比较帖子发布时间和当前时间     NSTimeInterval interval = [now timeIntervalSinceDate:date];           NSString *format;     if (interval <= 60) {         format = @"刚刚";     } else if(interval <= 60*60){         format = [NSString stringWithFormat:@"发布于前%.f分钟", interval/60];     } else if(interval <= 60*60*24){         format = [NSString stringWithFormat:@"发布于前%.f小时", interval/3600];     } else if (interval <= 60*60*24*7){         format = [NSString stringWithFormat:@"发布于前%d天", (int)interval/(60*60*24)];     } else if (interval > 60*60*24*7 & interval <= 60*60*24*30 ){         format = [NSString stringWithFormat:@"发布于前%d周", (int)interval/(60*60*24*7)];     }else if(interval > 60*60*24*30 ){         format = [NSString stringWithFormat:@"发布于前%d月", (int)interval/(60*60*24*30)];     }           formatter.dateFormat = format;     return [formatter stringFromDate:date]; }