I\'m creating a report generator in Cocoa, and I need to produce convenient date ranges such as \"Today\", \"This Week\", \"This Month\", \"This Year\", etc.
Is there a
Well since timeInterval is in seconds, just do the math to figure out how many seconds are in a day:
60 seconds * 60 minutes * 24 hours = 1 day.
Then in your rangeForDayContainingDate
method you could extract date components, get the current day, create a new date based on the day with hours and minutes set to 0:00, and the create the end date adding the time interval as calculated above.
For the sake of completeness, here is my final solution (with thanks to Kendall Helmstetter Geln and jbrennan):
+ (NSCalendar *)calendar
{
NSCalendar * gregorian = [[NSCalendar alloc]
initWithCalendarIdentifier:NSGregorianCalendar];
return [gregorian autorelease];
}
////////////////////////////////////////////////////////////////
+ (NSDateComponents *)singleComponentOfUnit:(NSCalendarUnit)unit
{
NSDateComponents * component = [[NSDateComponents alloc] init];
switch (unit)
{
case NSDayCalendarUnit: [component setDay:1]; break;
case NSWeekCalendarUnit: [component setWeek:1]; break;
case NSMonthCalendarUnit: [component setMonth:1]; break;
case NSYearCalendarUnit: [component setYear:1]; break;
}
return [component autorelease];
}
////////////////////////////////////////////////////////////////
+ (WM_DateRange *)rangeForUnit:(NSCalendarUnit)unit
surroundingDate:(NSDate *)date
{
WM_DateRange * range = [[self alloc] init];
// start of the period
NSDate * firstDay;
[[self calendar] rangeOfUnit:unit
startDate:&firstDay
interval:0
forDate:date];
[range setStartDate:firstDay];
// end of the period
[range setEndDate:[[self calendar]
dateByAddingComponents:[self singleComponentOfUnit:unit]
toDate:firstDay
options:0]];
return [range autorelease];
}
////////////////////////////////////////////////////////////////
+ (WM_DateRange *)rangeForDayContainingDate:(NSDate *)date
{ return [self rangeForUnit:NSDayCalendarUnit surroundingDate:date]; }
+ (WM_DateRange *)rangeForWeekContainingDate:(NSDate *)date
{ return [self rangeForUnit:NSWeekCalendarUnit surroundingDate:date]; }
+ (WM_DateRange *)rangeForMonthContainingDate:(NSDate *)date
{ return [self rangeForUnit:NSMonthCalendarUnit surroundingDate:date]; }
+ (WM_DateRange *)rangeForYearContainingDate:(NSDate *)date
{ return [self rangeForUnit:NSYearCalendarUnit surroundingDate:date]; }
////////////////////////////////////////////////////////////////
- (void)dealloc
{
[endDate release];
[startDate release];
[super dealloc];
}