From 462d73da2497ba0949e787a1e1955dc403c9ff2b Mon Sep 17 00:00:00 2001
From: Melvin Rivera <melvin@allforces.com>
Date: Thu, 26 May 2016 13:42:34 -0400
Subject: [PATCH] Added dateByAddingMonths, dateBySubtractingMonths,
 dateByAddingWeeks, dateBySubtractingWeeks

---
 AFDateHelper/AFDateExtension.swift | 52 ++++++++++++++++++++++++++++++
 Demo/ViewController.swift          | 16 +++++++++
 README.md                          |  4 +++
 3 files changed, 72 insertions(+)

diff --git a/AFDateHelper/AFDateExtension.swift b/AFDateHelper/AFDateExtension.swift
index d9852c8..9efb436 100644
--- a/AFDateHelper/AFDateExtension.swift
+++ b/AFDateHelper/AFDateExtension.swift
@@ -337,6 +337,58 @@ public extension NSDate {
     
     // MARK: Adjusting Dates
     
+    /**
+     Creates a new date by a adding months.
+     
+     - Parameter days: The number of months to add.
+     - Returns A new date object.
+     */
+    func dateByAddingMonths(months: Int) -> NSDate
+    {
+        let dateComp = NSDateComponents()
+        dateComp.month = months
+        return NSCalendar.currentCalendar().dateByAddingComponents(dateComp, toDate: self, options: NSCalendarOptions(rawValue: 0))!
+    }
+    
+    /**
+     Creates a new date by a substracting months.
+     
+     - Parameter days: The number of months to substract.
+     - Returns A new date object.
+     */
+    func dateBySubtractingMonths(months: Int) -> NSDate
+    {
+        let dateComp = NSDateComponents()
+        dateComp.month = (months * -1)
+        return NSCalendar.currentCalendar().dateByAddingComponents(dateComp, toDate: self, options: NSCalendarOptions(rawValue: 0))!
+    }
+    
+    /**
+     Creates a new date by a adding weeks.
+     
+     - Parameter days: The number of weeks to add.
+     - Returns A new date object.
+     */
+    func dateByAddingWeeks(weeks: Int) -> NSDate
+    {
+        let dateComp = NSDateComponents()
+        dateComp.day = 7 * weeks
+        return NSCalendar.currentCalendar().dateByAddingComponents(dateComp, toDate: self, options: NSCalendarOptions(rawValue: 0))!
+    }
+    
+    /**
+     Creates a new date by a substracting weeks.
+     
+     - Parameter days: The number of weeks to substract.
+     - Returns A new date object.
+     */
+    func dateBySubtractingWeeks(weeks: Int) -> NSDate
+    {
+        let dateComp = NSDateComponents()
+        dateComp.day = ((7 * weeks) * -1)
+        return NSCalendar.currentCalendar().dateByAddingComponents(dateComp, toDate: self, options: NSCalendarOptions(rawValue: 0))!
+    }
+    
     /**
     Creates a new date by a adding days.
     
diff --git a/Demo/ViewController.swift b/Demo/ViewController.swift
index f3c8612..3146467 100644
--- a/Demo/ViewController.swift
+++ b/Demo/ViewController.swift
@@ -166,6 +166,22 @@ class ViewController: UITableViewController {
         sections.append("Adjusting Dates")
         sectionItems = [TableItem]()
         
+        // MARK: dateByAddingMonths
+        date = now.dateByAddingMonths(2)
+        sectionItems.append(TableItem(title: "Adding Months", description: "+ 2 Months: \(date.toString())"))
+        
+        // MARK: dateBySubstractingMonths
+        date = now.dateBySubtractingMonths(4)
+        sectionItems.append(TableItem(title: "Substracting Months", description: "- 4 Months: \(date.toString())"))
+        
+        // MARK: dateByAddingWeeks
+        date = now.dateByAddingWeeks(2)
+        sectionItems.append(TableItem(title: "Adding Weeks", description: "+ 2 Weeks: \(date.toString())"))
+        
+        // MARK: dateBySubstractingWeeks
+        date = now.dateBySubtractingWeeks(4)
+        sectionItems.append(TableItem(title: "Substracting Weeks", description: "- 4 Weeks: \(date.toString())"))
+        
         // MARK: dateByAddingDays
         date = now.dateByAddingDays(2)
         sectionItems.append(TableItem(title: "Adding Days", description: "+ 2 Days: \(date.toString())"))
diff --git a/README.md b/README.md
index c0c14ce..e243932 100644
--- a/README.md
+++ b/README.md
@@ -63,6 +63,10 @@ date.isLastYear() -> Bool
 
 ### Adjusting Dates
 ```Swift
+date.dateByAddingMonths(2) -> NSDate
+date.dateBySubtractingMonths(4) -> NSDate
+date.dateByAddingWeeks(2) -> NSDate
+date.dateBySubtractingWeeks(4) -> NSDate
 date.dateByAddingDays(2) -> NSDate
 date.dateBySubtractingDays(4) -> NSDate
 date.dateByAddingHours(2) -> NSDate