1 // 當前時間建立nsdate
nsdate *mydate = [nsdate
date];
nslog(@"mydate = %@",mydate);
2 //從現在開始的24小時
nstimeinterval secondsperday = 24*60*60;
nsdate *tomorrow = [nsdate
datewithtimeintervalsincenow:secondsperday];
nslog(@"mydate = %@",tomorrow);
3//根據已有日期建立日期
nstimeinterval secondsperday1 = 24*60*60;
nsdate *now = [nsdate
date];
nsdate *yesterday = [now addtimeinterval:-secondsperday1];
nslog(@"yesterday = %@",yesterday);
4//比較日期
bool samedate = [now isequaltodate:yesterday];
nslog(@"samedate = %lu",samedate);
4.1//獲取較早的日期
nsdate *earlierdate = [yesterday earlierdate:now];
nslog(@"earlierdate = %@",earlierdate);
4.2//
較晚的日期
nsdate *laterdate = [yesterday laterdate:now];
nslog(@"laterdate = %@",laterdate);
//兩個日期之間相隔多少秒
nstimeinterval secondsbetweendates= [yesterday timeintervalsincedate:now];
nslog(@"secondsbetweendates= %lf",secondsbetweendates);
//通過nscalendar類來建立日期
nsdatecomponents*comp = [[nsdatecomponentsalloc
]init];
[comp setmonth:06];
[comp setday:01];
[comp setyear:2001];
nscalendar*mycal = [[nscalendaralloc
]initwithcalendaridentifier
:nsgregoriancalendar];
nsdate *mydate1 = [mycal datefromcomponents:comp];
nslog(@"mydate1 = %@",mydate1);
//從已有日期獲取日期
unsigned
units = nsmonthcalendarunit|nsdaycalendarunit|nsyearcalendarunit;
nsdatecomponents *comp1 = [mycal components:units fromdate:now];
nsinteger month = [comp1 month];
nsinteger year = [comp1 year];
nsinteger day = [comp1 day];
//nsdateformatter實現日期的輸出
nsdateformatter*formatter = [[nsdateformatteralloc
]init];
[formatter setdatestyle:nsdateformatterfullstyle];
//直接輸出的話是機器碼
//或者是手動設定樣式
[formatter setdateformat:@"yyyy-mm-dd"];
nsstring *string = [formatter stringfromdate:now];
nslog(@"string = %@",string);
nslog(@"formater = %@",formatter);
//獲取日期格式物件
- (nsdateformatter *)dateformatter
return
dateformatter;
}
NSDate初步使用
nsdate 的常用用法 1.建立或初始化可用以下方法 用於建立 nsdate 例項的類方法有 id date 返回當前時間 id datewithtimeintervalsincenow nstimeinterval secs 返回以當前時間為基準,然後過了 secs 秒的時間 id datewi...
NSDate總結 學習筆記
nsdate是用作處理日期的類。1 建立初始化nsdate類的方法 1 當前日期 nsdate date nsdatedate 2 根據當前時間建立，正數是當前時間過多少秒後的時間，負數是當前時間前多少秒的時間 nsdate date1 nsdatedatewithtimeintervalsince...
NSDate 總結日期操作
nsdate 1,建立nsdate物件 nsdate nowdate nsdate date nslog nowdate 2,建立明天現在的時間 nsdate tomorrow nsdate datewithtimeintervalsincenow 24 3600 nslog tomorrow 3,...