一个显示日期的工具类

.h文件

#import <Foundation/Foundation.h>

@interface TimeUtil : NSObject

+ (NSString*)getTimeStr1:(long long)time;

+(NSString*) getTimeStrStyle1:(long long)time;
+ (NSString*)getTimeStr1Short:(long long)time;

+(NSString*) getTimeStrStyle2:(long long)time;

+(int)dayCountForMonth:(int)month andYear:(int)year;

+(BOOL)isLeapYear:(int)year;

@end

.m文件

#import "TimeUtil.h"

@implementation TimeUtil

+ (NSString*)getTimeStr:(long) createdAt
{
    // Calculate distance time string
    //
    NSString *timestamp;
    time_t now;
    time(&now);

    int distance = (int)difftime(now, createdAt);
    if (distance < 0) distance = 0;

    if (distance < 60) {
        timestamp = [NSString stringWithFormat:@"%d %s", distance, (distance == 1) ? "second ago" : "seconds ago"];
    }
    else if (distance < 60 * 60) {
        distance = distance / 60;
        timestamp = [NSString stringWithFormat:@"%d %s", distance, (distance == 1) ?

"minute ago" : "minutes ago"];
    }
    else if (distance < 60 * 60 * 24) {
        distance = distance / 60 / 60;
        timestamp = [NSString stringWithFormat:@"%d %s", distance, (distance == 1) ? "hour ago" : "hours ago"];
    }
    else if (distance < 60 * 60 * 24 * 7) {
        distance = distance / 60 / 60 / 24;
        timestamp = [NSString stringWithFormat:@"%d %s", distance, (distance == 1) ? "day ago" : "days ago"];
    }
    else if (distance < 60 * 60 * 24 * 7 * 4) {
        distance = distance / 60 / 60 / 24 / 7;
        timestamp = [NSString stringWithFormat:@"%d %s", distance, (distance == 1) ? "week ago" : "weeks ago"];
    }
    else {
        static NSDateFormatter *dateFormatter = nil;
        if (dateFormatter == nil) {
            dateFormatter = [[NSDateFormatter alloc] init];
            [dateFormatter setDateStyle:NSDateFormatterShortStyle];
            [dateFormatter setTimeStyle:NSDateFormatterShortStyle];
        }

        NSDate *date = [NSDate dateWithTimeIntervalSince1970:createdAt];
        timestamp = [dateFormatter stringFromDate:date];
    }
    return timestamp;
}

+ (NSString*)getTimeStr1:(long long)time
{
    NSDate * date=[NSDate dateWithTimeIntervalSince1970:time];
    NSCalendar * calendar=[[NSCalendar alloc]initWithCalendarIdentifier:NSGregorianCalendar];
    NSInteger unitFlags = NSMonthCalendarUnit | NSDayCalendarUnit|NSYearCalendarUnit|NSHourCalendarUnit|NSMinuteCalendarUnit|NSSecondCalendarUnit;
    NSDateComponents * component=[calendar components:unitFlags fromDate:date];
    NSString * string=[NSString stringWithFormat:@"%04d-%02d-%02d %02d:%02d",[component year],[component month],[component day],[component hour],[component minute]];
    return string;
}

+ (NSString*)getTimeStr1Short:(long long)time
{
    NSDate * date=[NSDate dateWithTimeIntervalSince1970:time];
    NSCalendar * calendar=[[NSCalendar alloc]initWithCalendarIdentifier:NSGregorianCalendar];
    NSInteger unitFlags = NSMonthCalendarUnit | NSDayCalendarUnit|NSYearCalendarUnit|NSHourCalendarUnit|NSMinuteCalendarUnit|NSSecondCalendarUnit;
    NSDateComponents * component=[calendar components:unitFlags fromDate:date];
    NSString * string=[NSString stringWithFormat:@"%04d-%02d-%02d",[component year],[component month],[component day]];
    return string;
}

+ (NSString*)getMDStr:(long long)time
{

    NSDate * date=[NSDate dateWithTimeIntervalSince1970:time];
    NSCalendar * calendar=[[NSCalendar alloc]initWithCalendarIdentifier:NSGregorianCalendar];
    NSInteger unitFlags = NSMonthCalendarUnit | NSDayCalendarUnit|NSYearCalendarUnit|NSHourCalendarUnit|NSMinuteCalendarUnit|NSSecondCalendarUnit;
    NSDateComponents * component=[calendar components:unitFlags fromDate:date];
    NSString * string=[NSString stringWithFormat:@"%d月%d日",[component month],[component day]];
    return string;
}

+(NSDateComponents*) getComponent:(long long)time
{
    NSDate * date=[NSDate dateWithTimeIntervalSince1970:time];
    NSCalendar * calendar=[[NSCalendar alloc]initWithCalendarIdentifier:NSGregorianCalendar];
    NSInteger unitFlags = NSMonthCalendarUnit | NSDayCalendarUnit|NSYearCalendarUnit|NSHourCalendarUnit|NSMinuteCalendarUnit|NSSecondCalendarUnit;
    NSDateComponents * component=[calendar components:unitFlags fromDate:date];
    return component;
}

+(NSString*) getTimeStrStyle1:(long long)time
{
    NSDate * date=[NSDate dateWithTimeIntervalSince1970:time];
    NSCalendar * calendar=[[NSCalendar alloc]initWithCalendarIdentifier:NSGregorianCalendar];
    NSInteger unitFlags = NSMonthCalendarUnit | NSDayCalendarUnit|NSYearCalendarUnit|NSHourCalendarUnit|NSMinuteCalendarUnit|NSSecondCalendarUnit|NSWeekCalendarUnit|NSWeekdayCalendarUnit;
    NSDateComponents * component=[calendar components:unitFlags fromDate:date];

    int year=[component year];
    int month=[component month];
    int day=[component day];

    int hour=[component hour];
    int minute=[component minute];

    NSDate * today=[NSDate date];
    component=[calendar components:unitFlags fromDate:today];

    int t_year=[component year];

    NSString*string=nil;

    long long now=[today timeIntervalSince1970];

    long long distance=now-time;
    if(distance<60)
        [email protected]"刚刚";
    else if(distance<60*60)
        string=[NSString stringWithFormat:@"%lld分钟前",distance/60];
    else if(distance<60*60*24)
        string=[NSString stringWithFormat:@"%lld小时前",distance/60/60];
    else if(distance<60*60*24*7)
        string=[NSString stringWithFormat:@"%lld天前",distance/60/60/24];
    else if(year==t_year)
        string=[NSString stringWithFormat:@"%02d-%02d %d:%02d",month,day,hour,minute];
    else
        string=[NSString stringWithFormat:@"%d-%d-%d",year,month,day];

    return string;   

}
+(NSString*) getTimeStrStyle2:(long long)time
{

    NSDate * date=[NSDate dateWithTimeIntervalSince1970:time];
    NSCalendar * calendar=[[NSCalendar alloc]initWithCalendarIdentifier:NSGregorianCalendar];
    NSInteger unitFlags = NSMonthCalendarUnit | NSDayCalendarUnit|NSYearCalendarUnit|NSHourCalendarUnit|NSMinuteCalendarUnit|NSSecondCalendarUnit|NSWeekCalendarUnit|NSWeekdayCalendarUnit;
    NSDateComponents * component=[calendar components:unitFlags fromDate:date];

    int year=[component year];
    int month=[component month];
    int day=[component day];
    int hour=[component hour];
    int minute=[component minute];
    int week=[component week];
    int weekday=[component weekday];

    NSDate * today=[NSDate date];
    component=[calendar components:unitFlags fromDate:today];

    int t_year=[component year];
    int t_month=[component month];
    int t_day=[component day];
    int t_week=[component week];

    NSString*string=nil;
    if(year==t_year&&month==t_month&&day==t_day)
    {
        if(hour<6&&hour>=0)
            string=[NSString stringWithFormat:@"凌晨 %d:%02d",hour,minute];
        else if(hour>=6&&hour<12)
            string=[NSString stringWithFormat:@"上午 %d:%02d",hour,minute];
        else if(hour>=12&&hour<18)
            string=[NSString stringWithFormat:@"下午 %d:%02d",hour,minute];
        else
            string=[NSString stringWithFormat:@"晚上 %d:%02d",hour,minute];
    }
    else if(year==t_year&&week==t_week)
    {
        NSString * daystr=nil;
        switch (weekday) {
            case 1:
                [email protected]"日";
                break;
            case 2:
                [email protected]"一";
                break;
            case 3:
                [email protected]"二";
                break;
            case 4:
                [email protected]"三";
                break;
            case 5:
                [email protected]"四";
                break;
            case 6:
                [email protected]"五";
                break;
            case 7:
                [email protected]"六";
                break;
            default:
                break;
        }
        string=[NSString stringWithFormat:@"周%@ %d:%02d",daystr,hour,minute];
    }
    else if(year==t_year)
        string=[NSString stringWithFormat:@"%d月%d日",month,day];
    else
        string=[NSString stringWithFormat:@"%d年%d月%d日",year,month,day];

    return string;
}

+(int)dayCountForMonth:(int)month andYear:(int)year
{
    if (month==1||month==3||month==5||month==7||month==8||month==10||month==12) {
        return 31;
    }else if(month==4||month==6||month==9||month==11){
        return 30;
    }else if([self isLeapYear:year]){
        return 29;
    }else{
        return 28;
    }
}
+(BOOL)isLeapYear:(int)year
{
    if (year%400==0) {
        return YES;
    }else{
        if (year%4==0&&year%100!=0) {
            return YES;
        }else{
            return NO;
        }
    }
}

@end

时间： 2025-01-01 18:57:17

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