nsdate *now = [nsdate date];
nslog(@」now date is: %@」, now);
nscalendar *calendar = [nscalendar currentcalendar];
nsuinteger unitflags = nsyearcalendarunit | nsmonthcalendarunit | nsdaycalendarunit | nshourcalendarunit | nsminutecalendarunit | nssecondcalendarunit;
nsdatecomponents *datecomponent = [calendar components:unitflags fromdate:now];
int year = [datecomponent year];
int month = [datecomponent month];
int day = [datecomponent day];
int hour = [datecomponent hour];
int minute = [datecomponent minute];
int second = [datecomponent second];
nslog(@」year is: %d」, year);
nslog(@」month is: %d」, month);
nslog(@」day is: %d」, day);
nslog(@」hour is: %d」, hour);
nslog(@」minute is: %d」, minute);
nslog(@」second is: %d」, second);
第一種僅僅得出年份差的年齡
//計算年齡
nsstring *birth = @"1993-10-30";
nsdateformatter *dateformatter = [[nsdateformatter alloc]init];
[dateformatter setdateformat:@"yyyy-mm-dd"];
//生日
nsdate *birthday = [dateformatter datefromstring:birth];
//當前時間
nsstring *currentdatestr = [dateformatter stringfromdate:[nsdate date]];
nsdate *currentdate = [dateformatter datefromstring:currentdatestr];
nslog(@"currentdate %@ birthday %@",currentdatestr,birth);
nstimeinterval time=[currentdate timeintervalsincedate:birthday];
int age = ((int)time)/(3600*24*365);
nslog(@"year %d",age);
另外一種得出詳細到天的年齡
nscalendar *calendar = [nscalendar currentcalendar];//定義乙個nscalendar物件
nsdate *nowdate = [nsdate date];
nsstring *birth = @"1900-10-30";
nsdateformatter *dateformatter = [[nsdateformatter alloc]init];
[dateformatter setdateformat:@"yyyy-mm-dd"];
//生日
nsdate *birthday = [dateformatter datefromstring:birth];
//用來得到詳細的時差
unsigned int unitflags = nsyearcalendarunit | nsmonthcalendarunit | nsdaycalendarunit | nshourcalendarunit | nsminutecalendarunit | nssecondcalendarunit;
nsdatecomponents *date = [calendar components:unitflags fromdate:birthday todate:nowdate options:0];
if([date year] >0)
else if([date month] >0)
else if([date day]>0)
else
字串、日期、int轉換
此項參考：
1、字串轉換為日期
nsdateformatter* dateformat = [[nsdateformatter alloc] init];//例項化乙個nsdateformatter物件
[dateformat setdateformat:@"yyyy-mm-dd hh:mm:ss"];//設定時間格式,這裡能夠設定成自己須要的格式
nsdate *date =[dateformat datefromstring:@"1980-01-01 00:00:01"];
2、日期轉換為字串
nsdateformatter* dateformat = [[nsdateformatter alloc] init];//例項化乙個nsdateformatter物件
[dateformat setdateformat:@"yyyy-mm-dd hh:mm:ss"];//設定時間格式,這裡能夠設定成自己須要的格式
nsstring *currentdatestr = [dateformat stringfromdate:[nsdate date]];
3、字串轉int
convert nsstring to int
nsstring *anumberstring = @"123";
int i = [anumberstring intvalue];
4、int轉字串
convert int to nsstring
int anumber = 123;
nsstring *astring = [nsstring stringwithformat:@"%d", anumber];
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