时间

// 获取当前时间戳
-(NSString *)getNowTimeTimestamp{

    NSDateFormatter *formatter = [[NSDateFormatter alloc] init] ;
    [formatter setDateStyle:NSDateFormatterMediumStyle];
    [formatter setTimeStyle:NSDateFormatterShortStyle];
    [formatter setDateFormat:@"YYYY-MM-dd HH:mm:ss"];
    NSTimeZone* timeZone = [NSTimeZone timeZoneWithName:@"Asia/Beijing"];
    [formatter setTimeZone:timeZone];

    NSDate *datenow = [NSDate date];
    NSString *timeSp = [NSString stringWithFormat:@"%ld", (long)[datenow timeIntervalSince1970]];

    return timeSp;
}

-(void)getCurrentTime
{
    NSDate *sendDate=[NSDate date];
    NSDateFormatter *dateFormatter=[[NSDateFormatter alloc]init];
    [dateFormatter setDateFormat:@"YYYY-MM-dd HH:mm:ss"];

    NSCalendar *calendar=[NSCalendar currentCalendar];
    NSUInteger unitFlags=NSCalendarUnitDay|NSCalendarUnitMonth|NSCalendarUnitYear|NSCalendarUnitWeekday|NSCalendarUnitHour|NSCalendarUnitMinute|NSCalendarUnitSecond;
    NSDateComponents *components=[calendar components:unitFlags fromDate:sendDate];
    NSInteger year=[components year];
    NSInteger month=[components month];
    NSInteger day=[components day];
    NSInteger weekday=[components weekday];
}

_timeArray=[[NSMutableArray alloc]initWithObjects:@"00:00",@"00:30",@"01:00",@"01:30",@"02:00",@"02:30",@"03:00",@"03:30",@"04:00",@"04:30",@"05:00",@"05:30",@"06:00",@"06:30",@"07:00",@"07:30",@"08:00",@"08:30",@"09:00",@"09:30",@"10:00",@"10:30",@"11:00",@"11:30",@"12:00",@"12:30",@"13:00",@"13:30",@"14:00",@"14:30",@"15:00",@"15:30",@"16:00",@"16:30",@"17:00",@"17:30",@"18:00",@"18:30",@"19:00",@"19:30",@"20:00",@"20:30",@"21:00",@"21:30",@"22:00",@"22:30",@"23:00",@"23:30",@"24:00",nil];

    _weekArray=[NSArray arrayWithObjects:@"Sunday",@"Monday", @"Tuesday",@"Wednesday",@"Thursday",@"Friday",@"Saturday",nil];
    _monthArray=[NSArray arrayWithObjects:@"January",@"February",@"March",@"April",@"May",@"June",@"July",@"August",@"September",@"October",@"November", @"December", nil];

//日期转为星期
- (NSString*)weekdayStringFromDate:(NSDate*)inputDate {

    NSArray *weekdays = [NSArray arrayWithObjects: [NSNull null], @"Sunday",@"Monday", @"Tuesday",@"Wednesday",@"Thursday",@"Friday",@"Saturday",nil];

    NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
    NSTimeZone *timeZone = [[NSTimeZone alloc] initWithName:@"Asia/Shanghai"];
    [calendar setTimeZone: timeZone];
    NSCalendarUnit calendarUnit = NSCalendarUnitWeekday;
    NSDateComponents *theComponents = [calendar components:calendarUnit fromDate:inputDate];
    return [weekdays objectAtIndex:theComponents.weekday];
}


//日期格式转字符串
- (NSString *)dateToString:(NSDate *)date withDateFormat:(NSString *)format
{
    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
    [dateFormatter setDateFormat:format];
    NSString *strDate = [dateFormatter stringFromDate:date];

    return strDate;
}

//字符串转日期格式
- (NSDate *)stringToDate:(NSString *)dateString withDateFormat:(NSString *)format
{
    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
    [dateFormatter setDateFormat:format];
    NSDate *date = [dateFormatter dateFromString:dateString];
    return date;
}

//将世界时间转化为中国区时间
- (NSDate *)worldTimeToChinaTime:(NSDate *)date
{
    NSTimeZone *timeZone = [NSTimeZone systemTimeZone];
    NSInteger interval = [timeZone secondsFromGMTForDate:date];
    NSDate *localeDate = [date  dateByAddingTimeInterval:interval];
    return localeDate;
}

- (NSDate *)getNowDateFromatAnDate:(NSDate *)anyDate
{
    NSTimeZone* sourceTimeZone = [NSTimeZone timeZoneWithAbbreviation:@"UTC"];//或GMT
    NSTimeZone* destinationTimeZone = [NSTimeZone timeZoneWithAbbreviation:@"GMT"];
    NSInteger sourceGMTOffset = [sourceTimeZone secondsFromGMTForDate:anyDate];
    NSInteger destinationGMTOffset = [destinationTimeZone secondsFromGMTForDate:anyDate];
    //得到时间偏移量的差值
    NSTimeInterval interval = destinationGMTOffset - sourceGMTOffset;
    //转为现在时间
    NSDate* destinationDateNow = [[NSDate alloc] initWithTimeInterval:interval sinceDate:anyDate];
    return destinationDateNow;
}

// 获取当月的天数
- (NSInteger)getNumberOfDaysInMonth
{
    NSCalendar * calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian]; // 指定日历的算法 NSGregorianCalendar - ios 8
    NSDate * currentDate = [NSDate date];
    NSRange range = [calendar rangeOfUnit:NSCalendarUnitDay  //NSDayCalendarUnit - ios 8
                                   inUnit: NSCalendarUnitMonth //NSMonthCalendarUnit - ios 8
                                  forDate:currentDate];
    return range.length;
}

-(NSString *)getTheDayOfTheWeekByDateString:(NSString *)dateString{

    NSDateFormatter *inputFormatter=[[NSDateFormatter alloc]init];
    [inputFormatter setDateFormat:@"yyyy-MM-dd"];
    NSDate *formatterDate=[inputFormatter dateFromString:dateString];
    NSDateFormatter *outputFormatter=[[NSDateFormatter alloc]init];
    [outputFormatter setDateFormat:@"EEEE-MMMM-d"];
    NSString *outputDateStr=[outputFormatter stringFromDate:formatterDate];
    NSArray *weekArray=[outputDateStr componentsSeparatedByString:@"-"];
    return [weekArray objectAtIndex:0];
}
- (NSString *)GetfutureDate:(NSDate *)currentDate andComps:(NSInteger)comps {
    NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
    NSDateComponents *components = [gregorian components:NSCalendarUnitWeekday | NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay fromDate:currentDate];
    [components setDay:([components day]+comps)];

    NSDate *beginningOfWeek = [gregorian dateFromComponents:components];
    NSDateFormatter *dateday = [[NSDateFormatter alloc] init];
    [dateday setDateFormat:@"yyyy-MM-dd"];
    return [dateday stringFromDate:beginningOfWeek];
}