iOS中NSDate常用转换操作整合

//当前时间格式化, 例:YYYY-MM-dd-EEEE-HH:mm:ss+ (NSString *)getCurrentDataWithDateFormate:(NSString *)formate{    NSDate *now = [NSDate date];    return [self dateFormattingWithDate:now toFormate:formate];}//任意NSDate格式化+ (NSString *)dateFormattingWithDate:(NSDate *)date toFormate:(NSString *)formate{    NSDateFormatter *formatter = [[NSDateFormatter alloc] init];    [formatter setDateFormat:formate];    return [formatter stringFromDate:date];}//获取当天0点时间+ (NSDate *)returnToDay0Clock{    NSDate *now = [NSDate date];    NSCalendar *calender = [NSCalendar currentCalendar];    NSUInteger unitFlags = NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay | NSCalendarUnitHour | NSCalendarUnitMinute | NSCalendarUnitSecond;    NSDateComponents *dateComponent = [calender components:unitFlags fromDate:now];    int hour = (int)[dateComponent hour];    int minute = (int)[dateComponent minute];    int second = (int)[dateComponent second];    //当前时分秒:hour,minute,second    //返回当前时间(hour * 3600 + minute * 60 + second)之前的时间,即为今天凌晨0点    NSDate *nowDay = [NSDate dateWithTimeIntervalSinceNow: - (hour * 3600 + minute * 60 + second)];    long long inter = [nowDay timeIntervalSince1970] * 1000;    NSDate *newDate = [NSDate dateWithTimeIntervalSince1970:inter / 1000];    return newDate;}//获取当天24点时间+ (NSDate *)returnToDay24Clock{    NSDate *now = [NSDate date];    NSCalendar *calender = [NSCalendar currentCalendar];    NSUInteger unitFlags = NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay | NSCalendarUnitHour | NSCalendarUnitMinute | NSCalendarUnitSecond;    NSDateComponents *dateComponent = [calender components:unitFlags fromDate:now];    int hour = (int)[dateComponent hour];    int minute = (int)[dateComponent minute];    int second = (int)[dateComponent second];    //一天是60分钟 * 60秒 * 24小时 = 86400秒    NSDate *nextDay = [NSDate dateWithTimeIntervalSinceNow: - (hour * 3600 + minute * 60 + second) + 86400];    return nextDay;}//获取当前秒数+ (long long)getCurrentDateSecond{    return [[NSDate date] timeIntervalSince1970];}//NSDate转秒+ (long long)dateTosecond:(NSDate *)date{    return [date timeIntervalSince1970];}//秒转NSDate+ (NSDate *)secondToDate:(long long)second{    return [NSDate dateWithTimeIntervalSince1970:second];}//是否是12小时制; YES:12小时制 / NO:24小时制+ (BOOL)is12HourSystem{    NSString *formatStringForHour = [NSDateFormatter dateFormatFromTemplate:@"j" options:0 locale:[NSLocale autoupdatingCurrentLocale]];    NSRange contains = [formatStringForHour rangeOfString:@"a"];    BOOL is12HourSystem = contains.location != NSNotFound;    return is12HourSystem;}//朋友圈/聊天 时间显示样式+ (NSString *)dateDisplayResult:(long long)secondCount{    NSDate *date = [self secondToDate:secondCount];    NSCalendar *calender = [NSCalendar currentCalendar];    //判断是否是今天    if ([calender isDateInToday:date]) {        long long dateSecondCount = [[NSDate date] timeIntervalSinceDate:date];        if (dateSecondCount < 60) {            return @"刚刚";        }        if (dateSecondCount < (60 * 60)) {            return [NSString stringWithFormat:@"%d分钟前",(int)(dateSecondCount / 60)];        }        return [NSString stringWithFormat:@"%d小时前",(int)(dateSecondCount / (60 * 60))];    }    //判断是否是昨天    NSString *formatterString = @" HH:mm";    if ([calender isDateInYesterday:date]) {        formatterString = [@"昨天" stringByAppendingString:formatterString];    } else {        //判断是否是一年内        formatterString = [@"MM-dd" stringByAppendingString:formatterString];        //判断是否值一年之前        NSDateComponents *component = [calender components:NSCalendarUnitYear fromDate:date toDate:[NSDate date] options:NSCalendarWrapComponents];        if (component.year >= 1) {            formatterString = [@"YYYY-" stringByAppendingString:formatterString];        }    }    NSDateFormatter *formatter = [[NSDateFormatter alloc] init];    [formatter setDateFormat:formatterString];    formatter.locale = [NSLocale localeWithLocaleIdentifier:@"en"];    return [formatter stringFromDate:date];}//比较两个NsDate对象的时间差+ (CompareResult *)compareDateDifferenceDate1:(NSDate *)date1 date2:(NSDate *)date2{    CompareResult *result = [[CompareResult alloc] init];    result.value = (fabs([date1 timeIntervalSinceDate:date2]));    result.trend = [date1 compare:date2];    return result;}

工程代码下载地址(更多常用操作整合)