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NSDateFormatter* dateFormat = [[NSDateFormatter alloc] init]; [dateFormat setDateFormat:@"yyyy-MM-dd"]; NSDate *insert = [dateFormat dateFromString:model.inserttime]; NSTimeInterval inserttime = [insert timeIntervalSince1970]; //相差8个小时 inserttime = inserttime + 29760; NSTimeInterval LocalTime = [[NSDate date] timeIntervalSince1970]; //86400 一天的秒数 int day = LocalTime - inserttime - 86400;