iOS detect if date is within last week - ios

Question

I am trying to detect is a specific date is within the last 7 days (within the last week).
I have found a method to do that, but its eating my performance in a tableview (chat controller).
The code is posted below, and i know it can be done a LOT better, but i am running out of ideas. Does somebody have better approach? thanks!
The code:
NSDate *date = [[_messages objectAtIndex:indexPath.row] date];
NSString *lastMessageDateString = [[[NVDate alloc] initUsingDate:date] stringValueWithFormat:#"dd/MM/yy"];
NSString *todayDateString = [[[NVDate alloc] initUsingToday] stringValueWithFormat:#"dd/MM/yy"];
NSString *yesterdayDateString = [[[[NVDate alloc] initUsingToday] previousDay] stringValueWithFormat:#"dd/MM/yy"];
NSString *earlier2DaysDateString = [[[[NVDate alloc] initUsingToday] previousDays:2] stringValueWithFormat:#"dd/MM/yy"];
NSString *earlier3DaysDateString = [[[[NVDate alloc] initUsingToday] previousDays:3] stringValueWithFormat:#"dd/MM/yy"];
NSString *earlier4DaysDateString = [[[[NVDate alloc] initUsingToday] previousDays:4] stringValueWithFormat:#"dd/MM/yy"];
NSString *earlier5DaysDateString = [[[[NVDate alloc] initUsingToday] previousDays:5] stringValueWithFormat:#"dd/MM/yy"];
NSString *earlier6DaysDateString = [[[[NVDate alloc] initUsingToday] previousDays:6] stringValueWithFormat:#"dd/MM/yy"];
NSString *earlier7DaysDateString = [[[[NVDate alloc] initUsingToday] previousDays:7] stringValueWithFormat:#"dd/MM/yy"];
//return the time of the message since it is today
if ([lastMessageDateString isEqualToString:todayDateString]) {
return [SAD.myE.timeFormat stringFromDate:date];
}
//return the string "yesterday" of the message since it is yesterday
else if ([lastMessageDateString isEqualToString:yesterdayDateString]) {
return #"Yesterday";
}
//return the string of the actual day of the message since it is within last 7 days
else if ([lastMessageDateString isEqualToString:earlier2DaysDateString] ||
[lastMessageDateString isEqualToString:earlier3DaysDateString] ||
[lastMessageDateString isEqualToString:earlier4DaysDateString] ||
[lastMessageDateString isEqualToString:earlier5DaysDateString] ||
[lastMessageDateString isEqualToString:earlier6DaysDateString] ||
[lastMessageDateString isEqualToString:earlier7DaysDateString]) {
return [SAD.myE.dayFormat stringFromDate:date];
}
//return the string date since the message is olf
else {
return [SAD.myE.dateFormat stringFromDate:date];
}
EDIT
Thanks to #vikingosegundo i have tried to use his solution to implement this solution. He since then made a category that made it even easier that i will try and implement now. Just for the curious ones:
- (NSString *)stringForDate:(NSDate *)date {
NSDate *now = [NSDate date]; // now
NSDate *today;
[[NSCalendar currentCalendar] rangeOfUnit:NSDayCalendarUnit // beginning of this day
startDate:&today // save it here
interval:NULL
forDate:now];
NSDateComponents *comp = [[NSDateComponents alloc] init];
comp.day = 0;
NSDate * theDayToday = [[NSCalendar currentCalendar] dateByAddingComponents:comp toDate:today options:0];
if ([date compare:theDayToday] == NSOrderedDescending) {
return #"today";
}
comp.day = -1;
NSDate * yesterday = [[NSCalendar currentCalendar] dateByAddingComponents:comp toDate:today options:0];
if ([date compare:yesterday] == NSOrderedDescending) {
return #"yesterday";
}
comp.day = -7; // lets go 7 days back from today
NSDate * oneWeekBefore = [[NSCalendar currentCalendar] dateByAddingComponents:comp toDate:today options:0];
if ([date compare:oneWeekBefore] == NSOrderedDescending) {
return #"within 7 days";
} else {
return #"before 7 days";
}
}

Answer 1

-(BOOL) dayOccuredDuringLast7Days
{
NSDate *now = [NSDate date]; // now
NSDate *today;
[[NSCalendar currentCalendar] rangeOfUnit:NSDayCalendarUnit // beginning of this day
startDate:&today // save it here
interval:NULL
forDate:now];
NSDateComponents *comp = [[NSDateComponents alloc] init];
comp.day = -7; // lets go 7 days back from today
NSDate * oneWeekBefore = [[NSCalendar currentCalendar] dateByAddingComponents:comp
toDate:today
options:0];
if ([self compare: oneWeekBefore] == NSOrderedDescending) {
if ( [self compare:today] == NSOrderedAscending ) { // or now?
return YES;
}
}
return NO;
}
a complete command line example for last 7 days and yesterday. as category on NSDate
#import <Foundation/Foundation.h>
#interface NSDate (ExtendedComparions)
-(BOOL) dayOccuredDuringLast7Days;
-(BOOL) dayWasYesterday;
#end
#implementation NSDate (ExtendedComparions)
-(BOOL) _occuredDaysBeforeToday:(NSUInteger) nDaysBefore
{
NSDate *now = [NSDate date]; // now
NSDate *today;
[[NSCalendar currentCalendar] rangeOfUnit:NSDayCalendarUnit // beginning of this day
startDate:&today // save it here
interval:NULL
forDate:now];
NSDateComponents *comp = [[NSDateComponents alloc] init];
comp.day = -nDaysBefore; // lets go N days back from today
NSDate * before = [[NSCalendar currentCalendar] dateByAddingComponents:comp
toDate:today
options:0];
if ([self compare: before] == NSOrderedDescending) {
if ( [self compare:today] == NSOrderedAscending ) {
return YES;
}
}
return NO;
}
-(BOOL) dayOccuredDuringLast7Days
{
return [self _occuredDaysBeforeToday:7];
}
-(BOOL) dayWasYesterday
{
return [self _occuredDaysBeforeToday:1];
}
#end
int main(int argc, const char * argv[])
{
#autoreleasepool {
NSDate *now =[NSDate date];
NSDate *twoDaysBefore = [[NSCalendar currentCalendar] dateByAddingComponents:(
{
NSDateComponents *comps = [[NSDateComponents alloc] init];
comps.day = -2;
comps;
})
toDate:now
options:0];
if ([twoDaysBefore dayOccuredDuringLast7Days]) {
NSLog(#"last week");
} else {
NSLog(#"not last week");
}
if ([twoDaysBefore dayWasYesterday]) {
NSLog(#"yesteday");
} else {
NSLog(#"not yesterday");
}
}
return 0;
}