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
#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)
string=@"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:
daystr=@"日";
break;
case 2:
daystr=@"一";
break;
case 3:
daystr=@"二";
break;
case 4:
daystr=@"三";
break;
case 5:
daystr=@"四";
break;
case 6:
daystr=@"五";
break;
case 7:
daystr=@"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原文：http://blog.csdn.net/quanqinyang/article/details/36015393