Common NSDate methods (to be supplemented)

/**

** Determine whether the date is this week

**/

 

-(BOOL) isCurrentWeek :( NSString *) dateStr {

NSDateFormatter * dateFormatter = [[NSDateFormatteralloc] init];

[DateFormatter setDateFormat: @ "yyyy-MM-dd"];

NSDate * date = [dateFormatter dateFromString: dateStr];

[DateFormatter release];

NSDate * start;

NSTimeInterval extends;

NSCalendar * cal = [NSCalendarautoupdatingCurrentCalendar];

[Cal setFirstWeekday: 2]; // set the first day of a week to Monday.

NSDate * today = [NSDatedate];

BOOL success = [calrangeOfUnit: NSWeekCalendarUnit startDate: & start interval: & extends forDate: today];

If (! Success)

Return NO;

NSTimeInterval dateInSecs = [date timeIntervalSinceReferenceDate];

NSTimeInterval dayStartInSecs = [starttimeIntervalSinceReferenceDate];

If (dateInSecs> = dayStartInSecs & dateInSecs <(dayStartInSecs + extends )){

Return YES;

}

Else {

Return NO;

}

}

 

 

/***

* ** Calculate the number of weeks by date

****/

-(NSString *) weekDayWithDate :( NSString *) date {

NSDateFormatter * dateFormatter = [[NSDateFormatter alloc] init];

[DateFormatter setDateFormat: @ "yyyy-MM-dd"];

NSDate * fromdate = [dateFormatter dateFromString: date];

NSCalendar * gregorian = [NSCalendar currentCalendar];

NSDateComponents * weekDayComponents = [gregorian components: NSWeekdayCalendarUnit fromDate: fromdate];

NSInteger mDay = [weekDayComponents weekday];

[DateFormatter release];

NSString * week = @"";

Switch (mDay ){

Case 0 :{

Week = @ "day ";

Break;

}

Case 1 :{

Week = @ "day ";

Break;

}

Case 2 :{

Week = @ "1 ";

Break;

}

Case 3 :{

Week = @ "2 ";

Break;

}

Case 4 :{

Week = @ "3 ";

Break;

}

Case 5 :{

Week = @ "4 ";

Break;

}

Case 6 :{

Week = @ "5 ";

Break;

}

Case 7 :{

Week = @ "6 ";

Break;

}

Default :{

Break;

}

};

Return week;

}