Category是类别，一般情况用分类好，用Category去重写类的方法，仅对本Category有效，不会影响到其他类与原有类的关系。
NSDate+Category.h 代码：
#import <Foundation/Foundation.h> #define D_MINUTE 60
#define D_HOUR 3600
#define D_DAY 86400
#define D_WEEK 604800
#define D_YEAR 31556926 @interface NSDate (Category) - (NSString *)timeIntervalDescription; //距离当前的时间间隔描述
- (NSString *)minuteDescription; //精确到分钟的日期描述*/
- (NSString *)formattedTime;
- (NSString *)formattedDateDescription; //格式化日期描述
- (double)timeIntervalSince1970InMilliSecond;
+ (NSDate *)dateWithTimeIntervalInMilliSecondSince1970:(double)timeIntervalInMilliSecond;
+ (NSString *)formattedTimeFromTimeInterval:(long long)time; //从当前日期起的相对日期
+ (NSDate *) dateTomorrow;
+ (NSDate *) dateYesterday;
+ (NSDate *) dateWithDaysFromNow: (NSInteger) days;
+ (NSDate *) dateWithDaysBeforeNow: (NSInteger) days;
+ (NSDate *) dateWithHoursFromNow: (NSInteger) dHours;
+ (NSDate *) dateWithHoursBeforeNow: (NSInteger) dHours;
+ (NSDate *) dateWithMinutesFromNow: (NSInteger) dMinutes;
+ (NSDate *) dateWithMinutesBeforeNow: (NSInteger) dMinutes;
+ (NSString *)weekdayStringValue:(NSDate*)date; //日期比较
- (BOOL) isEqualToDateIgnoringTime: (NSDate *) aDate;
- (BOOL) isToday;
- (BOOL) isTomorrow;
- (BOOL) isYesterday;
- (BOOL) isSameWeekAsDate: (NSDate *) aDate;
- (BOOL) isThisWeek;
- (BOOL) isNextWeek;
- (BOOL) isLastWeek;
- (BOOL) isSameMonthAsDate: (NSDate *) aDate;
- (BOOL) isThisMonth;
- (BOOL) isSameYearAsDate: (NSDate *) aDate;
- (BOOL) isThisYear;
- (BOOL) isNextYear;
- (BOOL) isLastYear;
- (BOOL) isEarlierThanDate: (NSDate *) aDate;
- (BOOL) isLaterThanDate: (NSDate *) aDate;
- (BOOL) isInFuture;
- (BOOL) isInPast; //工作日和休息日
- (BOOL) isTypicallyWorkday;
- (BOOL) isTypicallyWeekend; //日期调整
- (NSDate *) dateByAddingDays: (NSInteger) dDays;
- (NSDate *) dateBySubtractingDays: (NSInteger) dDays;
- (NSDate *) dateByAddingHours: (NSInteger) dHours;
- (NSDate *) dateBySubtractingHours: (NSInteger) dHours;
- (NSDate *) dateByAddingMinutes: (NSInteger) dMinutes;
- (NSDate *) dateBySubtractingMinutes: (NSInteger) dMinutes;
- (NSDate *) dateAtStartOfDay; //检索的时间间隔
- (NSInteger) minutesAfterDate: (NSDate *) aDate;
- (NSInteger) minutesBeforeDate: (NSDate *) aDate;
- (NSInteger) hoursAfterDate: (NSDate *) aDate;
- (NSInteger) hoursBeforeDate: (NSDate *) aDate;
- (NSInteger) daysAfterDate: (NSDate *) aDate;
- (NSInteger) daysBeforeDate: (NSDate *) aDate;
- (NSInteger)distanceInDaysToDate:(NSDate *)anotherDate; //分解的日期
@property (readonly) NSInteger nearestHour;
@property (readonly) NSInteger hour;
@property (readonly) NSInteger minute;
@property (readonly) NSInteger seconds;
@property (readonly) NSInteger day;
@property (readonly) NSInteger month;
@property (readonly) NSInteger week;
@property (readonly) NSInteger weekday;
@property (readonly) NSInteger nthWeekday; // e.g. 2nd Tuesday of the month == 2
@property (readonly) NSInteger year; #pragma mark 日期格式化
+ (id)dateFormatter; + (id)dateFormatterWithFormat:(NSString *)dateFormat; + (id)defaultDateFormatter;/*yyyy-MM-dd HH:mm:ss*/ @end
NSDate+Category.m 代码：
#import "NSDate+Category.h" #define DATE_COMPONENTS (NSCalendarUnitYear| NSCalendarUnitMonth | NSCalendarUnitDay | NSCalendarUnitWeekOfYear | NSCalendarUnitHour | NSCalendarUnitMinute | NSCalendarUnitSecond | NSCalendarUnitWeekday | NSCalendarUnitWeekdayOrdinal)
#define CURRENT_CALENDAR [NSCalendar currentCalendar] @implementation NSDate (Category) /**
* @brief 距离当前的时间间隔描述
*
* @param paramete 请求参数
*
* @return NSString格式的请求参数
*/
- (NSString *)timeIntervalDescription
{
NSTimeInterval timeInterval = -[self timeIntervalSinceNow];
if (timeInterval < ) {
return @"1分钟内";
} else if (timeInterval < ) {
return [NSString stringWithFormat:@"%ld分钟前", (long)timeInterval/];
} else if (timeInterval < ) {
return [NSString stringWithFormat:@"%ld小时前", (long)timeInterval / ];
} else if (timeInterval < ) {//30天内
return [NSString stringWithFormat:@"%ld天前", (long)timeInterval / ];
} else if (timeInterval < ) {//30天至1年内
NSDateFormatter *dateFormatter = [NSDate dateFormatterWithFormat:@"M月d日"];
return [dateFormatter stringFromDate:self];
} else {
return [NSString stringWithFormat:@"%ld年前", (long)timeInterval / ];
}
} /**
* @brief 精确到分钟的日期描述
*
* @param paramete 请求参数
*
* @return NSString格式的请求参数
*/
- (NSString *)minuteDescription
{
NSDateFormatter *dateFormatter = [NSDate dateFormatterWithFormat:@"yyyy-MM-dd"]; NSString *theDay = [dateFormatter stringFromDate:self];//日期的年月日
NSString *currentDay = [dateFormatter stringFromDate:[NSDate date]];//当前年月日
if ([theDay isEqualToString:currentDay]) {//当天
[dateFormatter setDateFormat:@"ah:mm"];
return [dateFormatter stringFromDate:self];
} else if ([[dateFormatter dateFromString:currentDay] timeIntervalSinceDate:[dateFormatter dateFromString:theDay]] == ) {//昨天
[dateFormatter setDateFormat:@"ah:mm"];
return [NSString stringWithFormat:@"昨天 %@", [dateFormatter stringFromDate:self]];
} else if ([[dateFormatter dateFromString:currentDay] timeIntervalSinceDate:[dateFormatter dateFromString:theDay]] < * ) {//间隔一周内
[dateFormatter setDateFormat:@"EEEE ah:mm"];
return [dateFormatter stringFromDate:self];
} else {//以前
[dateFormatter setDateFormat:@"yyyy-MM-dd ah:mm"];
return [dateFormatter stringFromDate:self];
}
} /**
* @brief 标准时间日期描述
*
* @param paramete 请求参数
*
* @return NSString格式的请求参数
*/
-(NSString *)formattedTime{
NSDateFormatter* formatter = [[NSDateFormatter alloc]init];
[formatter setDateFormat:@"YYYY-MM-dd"];
NSString * dateNow = [formatter stringFromDate:[NSDate date]];
NSDateComponents *components = [[NSDateComponents alloc] init];
[components setDay:[[dateNow substringWithRange:NSMakeRange(,)] intValue]];
[components setMonth:[[dateNow substringWithRange:NSMakeRange(,)] intValue]];
[components setYear:[[dateNow substringWithRange:NSMakeRange(,)] intValue]];
NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
NSDate *date = [gregorian dateFromComponents:components]; //今天 0点时间 NSInteger hour = [self hoursAfterDate:date];
NSDateFormatter *dateFormatter = nil;
NSString *ret = @""; //hasAMPM==TURE为12小时制，否则为24小时制
NSString *formatStringForHours = [NSDateFormatter dateFormatFromTemplate:@"j" options: locale:[NSLocale currentLocale]];
NSRange containsA = [formatStringForHours rangeOfString:@"a"];
BOOL hasAMPM = containsA.location != NSNotFound; if (!hasAMPM) { //24小时制
if (hour <= && hour >= ) {
dateFormatter = [NSDate dateFormatterWithFormat:@"HH:mm"];
}else if (hour < && hour >= -) {
dateFormatter = [NSDate dateFormatterWithFormat:@"昨天HH:mm"];
}else {
dateFormatter = [NSDate dateFormatterWithFormat:@"yyyy-MM-dd HH:mm"];
}
}else {
if (hour >= && hour <= ) {
dateFormatter = [NSDate dateFormatterWithFormat:@"凌晨hh:mm"];
}else if (hour > && hour <= ) {
dateFormatter = [NSDate dateFormatterWithFormat:@"上午hh:mm"];
}else if (hour > && hour <= ) {
dateFormatter = [NSDate dateFormatterWithFormat:@"下午hh:mm"];
}else if (hour > && hour <= ) {
dateFormatter = [NSDate dateFormatterWithFormat:@"晚上hh:mm"];
}else if (hour < && hour >= -){
dateFormatter = [NSDate dateFormatterWithFormat:@"昨天HH:mm"];
}else {
dateFormatter = [NSDate dateFormatterWithFormat:@"yyyy-MM-dd HH:mm"];
}
} ret = [dateFormatter stringFromDate:self];
return ret;
} /**
* @brief 格式化日期描述
*
* @param paramete 请求参数
*
* @return NSString格式的请求参数
*/
- (NSString *)formattedDateDescription
{
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init]; [dateFormatter setDateFormat:@"yyyy-MM-dd"];
NSString *theDay = [dateFormatter stringFromDate:self];//日期的年月日
NSString *currentDay = [dateFormatter stringFromDate:[NSDate date]];//当前年月日 NSInteger timeInterval = -[self timeIntervalSinceNow]; if (timeInterval < ) {
return @"1分钟内";
} else if (timeInterval < ) {//1小时内
return [NSString stringWithFormat:@"%ld分钟前", (long)timeInterval / ];
} else if (timeInterval < ) {//6小时内
return [NSString stringWithFormat:@"%ld小时前", (long)timeInterval / ];
} else if ([theDay isEqualToString:currentDay]) {//当天
[dateFormatter setDateFormat:@"HH:mm"];
return [NSString stringWithFormat:@"今天 %@", [dateFormatter stringFromDate:self]];
} else if ([[dateFormatter dateFromString:currentDay] timeIntervalSinceDate:[dateFormatter dateFromString:theDay]] == ) {//昨天
[dateFormatter setDateFormat:@"HH:mm"];
return [NSString stringWithFormat:@"昨天 %@", [dateFormatter stringFromDate:self]];
} else {//以前
[dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm"];
return [dateFormatter stringFromDate:self];
}
} - (double)timeIntervalSince1970InMilliSecond {
double ret;
ret = [self timeIntervalSince1970] * ; return ret;
} + (NSDate *)dateWithTimeIntervalInMilliSecondSince1970:(double)timeIntervalInMilliSecond {
NSDate *ret = nil;
double timeInterval = timeIntervalInMilliSecond;
// 判断参数是否在secconds中(对于以前的数据结构)
if(timeIntervalInMilliSecond > ) {
timeInterval = timeIntervalInMilliSecond / ;
}
ret = [NSDate dateWithTimeIntervalSince1970:timeInterval]; return ret;
} + (NSString *)formattedTimeFromTimeInterval:(long long)time{
return [[NSDate dateWithTimeIntervalInMilliSecondSince1970:time] formattedTime];
} #pragma mark Relative Dates + (NSDate *) dateWithDaysFromNow: (NSInteger) days
{
return [[NSDate date] dateByAddingDays:days];
} + (NSDate *) dateWithDaysBeforeNow: (NSInteger) days
{
// Thanks, Jim Morrison
return [[NSDate date] dateBySubtractingDays:days];
} + (NSDate *) dateTomorrow
{
return [NSDate dateWithDaysFromNow:];
} + (NSDate *) dateYesterday
{
return [NSDate dateWithDaysBeforeNow:];
} + (NSDate *) dateWithHoursFromNow: (NSInteger) dHours
{
NSTimeInterval aTimeInterval = [[NSDate date] timeIntervalSinceReferenceDate] + D_HOUR * dHours;
NSDate *newDate = [NSDate dateWithTimeIntervalSinceReferenceDate:aTimeInterval];
return newDate;
} + (NSDate *) dateWithHoursBeforeNow: (NSInteger) dHours
{
NSTimeInterval aTimeInterval = [[NSDate date] timeIntervalSinceReferenceDate] - D_HOUR * dHours;
NSDate *newDate = [NSDate dateWithTimeIntervalSinceReferenceDate:aTimeInterval];
return newDate;
} + (NSDate *) dateWithMinutesFromNow: (NSInteger) dMinutes
{
NSTimeInterval aTimeInterval = [[NSDate date] timeIntervalSinceReferenceDate] + D_MINUTE * dMinutes;
NSDate *newDate = [NSDate dateWithTimeIntervalSinceReferenceDate:aTimeInterval];
return newDate;
} + (NSDate *) dateWithMinutesBeforeNow: (NSInteger) dMinutes
{
NSTimeInterval aTimeInterval = [[NSDate date] timeIntervalSinceReferenceDate] - D_MINUTE * dMinutes;
NSDate *newDate = [NSDate dateWithTimeIntervalSinceReferenceDate:aTimeInterval];
return newDate;
} + (NSString *)weekdayStringValue:(NSDate*)date
{
NSCalendar *calendar = [NSCalendar currentCalendar];
NSInteger unitFlags = NSWeekCalendarUnit|NSWeekdayCalendarUnit;
NSDateComponents *comps = [calendar components:unitFlags fromDate:date];
NSInteger weekday = [comps weekday];
switch (weekday)
{
case :
return @"星期天";
break;
case :
return @"星期一";
break;
case :
return @"星期二";
break;
case :
return @"星期三";
break;
case :
return @"星期四";
break;
case :
return @"星期五";
break;
case :
return @"星期六";
break; default:
break;
}
return nil;
} #pragma mark Comparing Dates
- (BOOL) isEqualToDateIgnoringTime: (NSDate *) aDate
{
NSDateComponents *components1 = [CURRENT_CALENDAR components:DATE_COMPONENTS fromDate:self];
NSDateComponents *components2 = [CURRENT_CALENDAR components:DATE_COMPONENTS fromDate:aDate];
return ((components1.year == components2.year) &&
(components1.month == components2.month) &&
(components1.day == components2.day));
} - (BOOL) isToday
{
return [self isEqualToDateIgnoringTime:[NSDate date]];
} - (BOOL) isTomorrow
{
return [self isEqualToDateIgnoringTime:[NSDate dateTomorrow]];
} - (BOOL) isYesterday
{
return [self isEqualToDateIgnoringTime:[NSDate dateYesterday]];
} - (BOOL) isSameWeekAsDate: (NSDate *) aDate
{
NSDateComponents *components1 = [CURRENT_CALENDAR components:DATE_COMPONENTS fromDate:self];
NSDateComponents *components2 = [CURRENT_CALENDAR components:DATE_COMPONENTS fromDate:aDate]; // 必须在同一周。12/31和1/1如果在同一周，都是周1
if (components1.weekOfYear != components2.weekOfYear) return NO; // 必须有一个时间间隔不到1周
return (fabs([self timeIntervalSinceDate:aDate]) < D_WEEK);
} - (BOOL) isThisWeek
{
return [self isSameWeekAsDate:[NSDate date]];
} - (BOOL) isNextWeek
{
NSTimeInterval aTimeInterval = [[NSDate date] timeIntervalSinceReferenceDate] + D_WEEK;
NSDate *newDate = [NSDate dateWithTimeIntervalSinceReferenceDate:aTimeInterval];
return [self isSameWeekAsDate:newDate];
} - (BOOL) isLastWeek
{
NSTimeInterval aTimeInterval = [[NSDate date] timeIntervalSinceReferenceDate] - D_WEEK;
NSDate *newDate = [NSDate dateWithTimeIntervalSinceReferenceDate:aTimeInterval];
return [self isSameWeekAsDate:newDate];
} - (BOOL) isSameMonthAsDate: (NSDate *) aDate
{
NSDateComponents *components1 = [CURRENT_CALENDAR components:NSCalendarUnitYear | NSCalendarUnitMonth fromDate:self];
NSDateComponents *components2 = [CURRENT_CALENDAR components:NSCalendarUnitYear | NSCalendarUnitMonth fromDate:aDate];
return ((components1.month == components2.month) &&
(components1.year == components2.year));
} - (BOOL) isThisMonth
{
return [self isSameMonthAsDate:[NSDate date]];
} - (BOOL) isSameYearAsDate: (NSDate *) aDate
{
NSDateComponents *components1 = [CURRENT_CALENDAR components:NSCalendarUnitYear fromDate:self];
NSDateComponents *components2 = [CURRENT_CALENDAR components:NSCalendarUnitYear fromDate:aDate];
return (components1.year == components2.year);
} - (BOOL) isThisYear
{
return [self isSameYearAsDate:[NSDate date]];
} - (BOOL) isNextYear
{
NSDateComponents *components1 = [CURRENT_CALENDAR components:NSCalendarUnitYear fromDate:self];
NSDateComponents *components2 = [CURRENT_CALENDAR components:NSCalendarUnitYear fromDate:[NSDate date]]; return (components1.year == (components2.year + ));
} - (BOOL) isLastYear
{
NSDateComponents *components1 = [CURRENT_CALENDAR components:NSCalendarUnitYear fromDate:self];
NSDateComponents *components2 = [CURRENT_CALENDAR components:NSCalendarUnitYear fromDate:[NSDate date]]; return (components1.year == (components2.year - ));
} - (BOOL) isEarlierThanDate: (NSDate *) aDate
{
return ([self compare:aDate] == NSOrderedAscending);
} - (BOOL) isLaterThanDate: (NSDate *) aDate
{
return ([self compare:aDate] == NSOrderedDescending);
} - (BOOL) isInFuture
{
return ([self isLaterThanDate:[NSDate date]]);
} - (BOOL) isInPast
{
return ([self isEarlierThanDate:[NSDate date]]);
} #pragma mark Roles
- (BOOL) isTypicallyWeekend
{
NSDateComponents *components = [CURRENT_CALENDAR components:NSCalendarUnitWeekday fromDate:self];
if ((components.weekday == ) ||
(components.weekday == ))
return YES;
return NO;
} - (BOOL) isTypicallyWorkday
{
return ![self isTypicallyWeekend];
} #pragma mark Adjusting Dates - (NSDate *) dateByAddingDays: (NSInteger) dDays
{
NSTimeInterval aTimeInterval = [self timeIntervalSinceReferenceDate] + D_DAY * dDays;
NSDate *newDate = [NSDate dateWithTimeIntervalSinceReferenceDate:aTimeInterval];
return newDate;
} - (NSDate *) dateBySubtractingDays: (NSInteger) dDays
{
return [self dateByAddingDays: (dDays * -)];
} - (NSDate *) dateByAddingHours: (NSInteger) dHours
{
NSTimeInterval aTimeInterval = [self timeIntervalSinceReferenceDate] + D_HOUR * dHours;
NSDate *newDate = [NSDate dateWithTimeIntervalSinceReferenceDate:aTimeInterval];
return newDate;
} - (NSDate *) dateBySubtractingHours: (NSInteger) dHours
{
return [self dateByAddingHours: (dHours * -)];
} - (NSDate *) dateByAddingMinutes: (NSInteger) dMinutes
{
NSTimeInterval aTimeInterval = [self timeIntervalSinceReferenceDate] + D_MINUTE * dMinutes;
NSDate *newDate = [NSDate dateWithTimeIntervalSinceReferenceDate:aTimeInterval];
return newDate;
} - (NSDate *) dateBySubtractingMinutes: (NSInteger) dMinutes
{
return [self dateByAddingMinutes: (dMinutes * -)];
} - (NSDate *) dateAtStartOfDay
{
NSDateComponents *components = [CURRENT_CALENDAR components:DATE_COMPONENTS fromDate:self];
components.hour = ;
components.minute = ;
components.second = ;
return [CURRENT_CALENDAR dateFromComponents:components];
} - (NSDateComponents *) componentsWithOffsetFromDate: (NSDate *) aDate
{
NSDateComponents *dTime = [CURRENT_CALENDAR components:DATE_COMPONENTS fromDate:aDate toDate:self options:];
return dTime;
} #pragma mark Retrieving Intervals - (NSInteger) minutesAfterDate: (NSDate *) aDate
{
NSTimeInterval ti = [self timeIntervalSinceDate:aDate];
return (NSInteger) (ti / D_MINUTE);
} - (NSInteger) minutesBeforeDate: (NSDate *) aDate
{
NSTimeInterval ti = [aDate timeIntervalSinceDate:self];
return (NSInteger) (ti / D_MINUTE);
} - (NSInteger) hoursAfterDate: (NSDate *) aDate
{
NSTimeInterval ti = [self timeIntervalSinceDate:aDate];
return (NSInteger) (ti / D_HOUR);
} - (NSInteger) hoursBeforeDate: (NSDate *) aDate
{
NSTimeInterval ti = [aDate timeIntervalSinceDate:self];
return (NSInteger) (ti / D_HOUR);
} - (NSInteger) daysAfterDate: (NSDate *) aDate
{
NSTimeInterval ti = [self timeIntervalSinceDate:aDate];
return (NSInteger) (ti / D_DAY);
} - (NSInteger) daysBeforeDate: (NSDate *) aDate
{
NSTimeInterval ti = [aDate timeIntervalSinceDate:self];
return (NSInteger) (ti / D_DAY);
} - (NSInteger)distanceInDaysToDate:(NSDate *)anotherDate
{
NSCalendar *gregorianCalendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
NSDateComponents *components = [gregorianCalendar components:NSCalendarUnitDay fromDate:self toDate:anotherDate options:];
return components.day;
} #pragma mark Decomposing Dates - (NSInteger) nearestHour
{
NSTimeInterval aTimeInterval = [[NSDate date] timeIntervalSinceReferenceDate] + D_MINUTE * ;
NSDate *newDate = [NSDate dateWithTimeIntervalSinceReferenceDate:aTimeInterval];
NSDateComponents *components = [CURRENT_CALENDAR components:NSCalendarUnitHour fromDate:newDate];
return components.hour;
} - (NSInteger) hour
{
NSDateComponents *components = [CURRENT_CALENDAR components:DATE_COMPONENTS fromDate:self];
return components.hour;
} - (NSInteger) minute
{
NSDateComponents *components = [CURRENT_CALENDAR components:DATE_COMPONENTS fromDate:self];
return components.minute;
} - (NSInteger) seconds
{
NSDateComponents *components = [CURRENT_CALENDAR components:DATE_COMPONENTS fromDate:self];
return components.second;
} - (NSInteger) day
{
NSDateComponents *components = [CURRENT_CALENDAR components:DATE_COMPONENTS fromDate:self];
return components.day;
} - (NSInteger) month
{
NSDateComponents *components = [CURRENT_CALENDAR components:DATE_COMPONENTS fromDate:self];
return components.month;
} - (NSInteger) week
{
NSDateComponents *components = [CURRENT_CALENDAR components:DATE_COMPONENTS fromDate:self];
return components.weekOfYear;
} - (NSInteger) weekday
{
NSDateComponents *components = [CURRENT_CALENDAR components:DATE_COMPONENTS fromDate:self];
return components.weekday;
} - (NSInteger) nthWeekday // e.g. 2nd Tuesday of the month is 2
{
NSDateComponents *components = [CURRENT_CALENDAR components:DATE_COMPONENTS fromDate:self];
return components.weekdayOrdinal;
} - (NSInteger) year
{
NSDateComponents *components = [CURRENT_CALENDAR components:DATE_COMPONENTS fromDate:self];
return components.year;
} #pragma mark 格式化日期
+ (id)dateFormatter
{
return [[self alloc] init];
} + (id)dateFormatterWithFormat:(NSString *)dateFormat
{
NSDateFormatter *dateFormatter = [[self alloc] init];
dateFormatter.dateFormat = dateFormat;
return dateFormatter;
} + (id)defaultDateFormatter
{
return [self dateFormatterWithFormat:@"yyyy-MM-dd HH:mm:ss"];
} @end