DateTools.swift

//: Playground - noun: a place where people can play

import UIKit

//
//  NSDate+Compare.swift
//  Node
//
//  Created by Sergii Frost on 2017-06-13.
//  Copyright © 2017 Rebtel. All rights reserved.
//

import Foundation

public extension Date {
    
    /**
     *  Returns a true if receiver is equal to provided comparison date, otherwise returns false
     *
     *  - parameter date: Provided date for comparison
     *
     *  - returns: Bool representing comparison result
     */
    public func equals(_ date: Date?) -> Bool {
        guard let date = date else {
            return false
        }
        return self.compare(date) == .orderedSame
    }
    
    /**
     *  Returns whether two dates fall on the same day.
     *
     *  - parameter date: Date to compare with sender
     *
     *  - returns: True if both paramter dates fall on the same day, false otherwise
     */
    public func isSameDay(date : Date?) -> Bool {
        guard let date = date else {
            return false
        }
        return Date.isSameDay(date: self, as: date)
    }
    
    /**
     *  Returns whether two dates fall on the same month.
     *
     *  - parameter date: Date to compare with sender
     *
     *  - returns: True if both paramter dates fall on the same month, false otherwise
     */
    public func isSameMonth(date : Date?) -> Bool {
        guard let date = date else {
            return false
        }
        return Date.isSameMonth(date: self, as: date)
    }
    
    /**
     *  Returns whether two dates fall on the same day.
     *
     *  - parameter date: First date to compare
     *  - parameter compareDate: Second date to compare
     *
     *  - returns: True if both paramter dates fall on the same day, false otherwise
     */
    public static func isSameDay(date: Date, as compareDate: Date) -> Bool {
        var calendar = Calendar.autoupdatingCurrent
        calendar.timeZone = TimeZone.autoupdatingCurrent
        var components = calendar.dateComponents([.era, .year, .month, .day], from: date)
        let dateOne = calendar.date(from: components)
        print(components)
        components = calendar.dateComponents([.era, .year, .month, .day], from: compareDate)
        print(components)
        let dateTwo = calendar.date(from: components)
        
        return dateOne?.equals(dateTwo) ?? false
    }
    
    /**
     *  Returns whether two dates fall on the same month.
     *
     *  - parameter date: First date to compare
     *  - parameter compareDate: Second date to compare
     *
     *  - returns: True if both paramter dates fall on the same month, false otherwise
     */
    public static func isSameMonth(date: Date, as compareDate: Date) -> Bool {
        let calendar = Calendar.autoupdatingCurrent
        var components = calendar.dateComponents([.era, .year, .month], from: date)
        let dateOne = calendar.date(from: components)
        
        components = calendar.dateComponents([.era, .year, .month], from: compareDate)
        let dateTwo = calendar.date(from: components)
        
        return dateOne?.equals(dateTwo) ?? false
    }
}

public extension NSDate {
    
    /**
     *  Returns whether two dates fall on the same day.
     *
     *  - parameter date: NSDate to compare with sender
     *
     *  - returns: True if both paramter dates fall on the same day, false otherwise
     */
    public func isSameDay(date: NSDate?) -> Bool {
        return (self as Date).isSameDay(date: date as Date?)
    }
    
    /**
     *  Returns whether two dates fall on the same month.
     *
     *  - parameter date: NSDate to compare with sender
     *
     *  - returns: True if both paramter dates fall on the same month, false otherwise
     */
    public func isSameMonth(date: NSDate?) -> Bool {
        return (self as Date).isSameMonth(date: date as Date?)
    }
    
}


var dateFormatter = DateFormatter()
dateFormatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ss.SSSZ"

let start = dateFormatter.date(from: "2017-06-12T00:00:00.000Z")
let end = dateFormatter.date(from: "2017-06-12T22:59:59.999Z")

print(start?.isSameDay(date: end) ?? false)
print(Calendar.current.isDate(start!, inSameDayAs: end!))