iOS date-related actions

Additional setup after loading the view, typically from a nib.    Get the current date note week1 is Sunday nsdate *date = [NSDate Date];        NSLog (@ "date:%@", date); Get (24 * 60 * 60) that is 24 hours before the date, datewithtimeintervalsincenow:nsdate *yesterday = [NSDate datewithtimeintervalsincenow:-(    24* 60* 60)];            NSLog (@ "yesterday:%@", yesterday);    NSDateFormatter *formatter =[[nsdateformatter alloc] init];    NSDate *date_ = [NSDate Date];    [Formatter Settimestyle:nsdateformattermediumstyle];        Nscalendar *calendar = [[Nscalendar alloc] Initwithcalendaridentifier:nsgregoriancalendar];    Nsdatecomponents *comps = [[Nsdatecomponents alloc] init];    Nsinteger unitflags = Nsyearcalendarunit |    Nsmonthcalendarunit |    Nsdaycalendarunit |    Nsweekdaycalendarunit |    Nshourcalendarunit |    Nsminutecalendarunit |        Nssecondcalendarunit;    int Week=0;week1 is Sunday, Week7 is Saturday;    Comps = [Calendar Components:unitflags fromdate:date];    Int week = [comps weekday]; INT year=[comps year];    int month = [Comps month];        int day = [Comps day];        [Formatter Setdatestyle:nsdateformattermediumstyle];        This sets the label with the updated time.    int hour = [Comps hour];    int min = [comps minute];    int sec = [comps second];    NSLog (@ "week:%d:%@", week,[self Week:week]);    NSLog (@ "year:%d", year);    NSLog (@ "month:%d", month);    NSLog (@ "day:%d", day);    NSLog (@ "hour:%d", hour);    NSLog (@ "min:%d", min);        NSLog (@ "sec:%d", sec);    Get millisecond NSDateFormatter *dateformatter = [[NSDateFormatter alloc] init];    [Dateformatter Setdatestyle:nsdateformattermediumstyle];    [Dateformatter Settimestyle:nsdateformattershortstyle]; [Dateformatter setdateformat:@ "Hh:mm:ss"] [dateformatter setdateformat:@ "Yyyy-mm-dd HH:mm:ss.    SSS "]; NSLog (@ "date:%@", [Dateformatter stringfromdate:[nsdate Date]]);

-(nsstring*) Week: (Nsinteger) week{    Nsstring*weekstr=nil;    if (week==1)    {        [email protected] "Sunday";    } else if (week==2) {        [email protected] "Monday";    } else if (week==3) {        [email protected] "Tuesday";    } else if (week==4) {        [email protected] "Wednesday";    } else if (week==5) {        [email protected] "Thursday";    } else if (week==6) {        [email protected] "Friday";    } else if (week==7) {        [email protected] "Saturday";    }    return WEEKSTR;}

byNSDateconverted toNSString:

NSDateFormatter *dateformatter = [[NSDateFormatter alloc] init]; [Dateformatter setdateformat:@ "Yyyy-mm-dd HH:mm:ss"]; NSString *strdate = [dateformatter stringfromdate:[nsdate Date]]; NSLog (@ "%@", strdate);

by NSString conversion to NSDate:

NSDateFormatter *dateformatter = [[NSDateFormatter alloc] init]; [Dateformatter setdateformat:@ "Yyyy-mm-dd HH:mm:ss"]; NSDate *date = [dateformatter datefromstring:@ "2010-08-04 16:01:03"]; NSLog (@ "%@", date);