get NSDate today, yesterday, this Week, last Week, this Month, last Month… variables

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Adapted from the Date and Time Programming Guide:

// Right now, you can remove the seconds into the day if you want
NSDate *today = [NSDate date];

// All intervals taken from Google
NSDate *yesterday = [today dateByAddingTimeInterval: -86400.0];
NSDate *thisWeek  = [today dateByAddingTimeInterval: -604800.0];
NSDate *lastWeek  = [today dateByAddingTimeInterval: -1209600.0];

// To get the correct number of seconds in each month use NSCalendar
NSDate *thisMonth = [today dateByAddingTimeInterval: -2629743.83];
NSDate *lastMonth = [today dateByAddingTimeInterval: -5259487.66];

If you want the correct exact number of days depending on the month, you should use an NSCalendar.

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