How do you compare just the time of a Date in Swift?
This is the route I took in the end, which makes it easy to compare just the time of a Date in swift
New Object Time:
class Time: Comparable, Equatable {
init(_ date: Date) {
//get the current calender
let calendar = Calendar.current
//get just the minute and the hour of the day passed to it
let dateComponents = calendar.dateComponents([.hour, .minute], from: date)
//calculate the seconds since the beggining of the day for comparisions
let dateSeconds = dateComponents.hour! * 3600 + dateComponents.minute! * 60
//set the varibles
secondsSinceBeginningOfDay = dateSeconds
hour = dateComponents.hour!
minute = dateComponents.minute!
}
init(_ hour: Int, _ minute: Int) {
//calculate the seconds since the beggining of the day for comparisions
let dateSeconds = hour * 3600 + minute * 60
//set the varibles
secondsSinceBeginningOfDay = dateSeconds
self.hour = hour
self.minute = minute
}
var hour : Int
var minute: Int
var date: Date {
//get the current calender
let calendar = Calendar.current
//create a new date components.
var dateComponents = DateComponents()
dateComponents.hour = hour
dateComponents.minute = minute
return calendar.date(byAdding: dateComponents, to: Date())!
}
/// the number or seconds since the beggining of the day, this is used for comparisions
private let secondsSinceBeginningOfDay: Int
//comparisions so you can compare times
static func == (lhs: Time, rhs: Time) -> Bool {
return lhs.secondsSinceBeginningOfDay == rhs.secondsSinceBeginningOfDay
}
static func < (lhs: Time, rhs: Time) -> Bool {
return lhs.secondsSinceBeginningOfDay < rhs.secondsSinceBeginningOfDay
}
static func <= (lhs: Time, rhs: Time) -> Bool {
return lhs.secondsSinceBeginningOfDay <= rhs.secondsSinceBeginningOfDay
}
static func >= (lhs: Time, rhs: Time) -> Bool {
return lhs.secondsSinceBeginningOfDay >= rhs.secondsSinceBeginningOfDay
}
static func > (lhs: Time, rhs: Time) -> Bool {
return lhs.secondsSinceBeginningOfDay > rhs.secondsSinceBeginningOfDay
}
}
Date Extension for easy access: //Adds ability to just get the time from a date:
extension Date {
var time: Time {
return Time(self)
}
}
Example:
let firstDate = Date()
let secondDate = firstDate
//Will return true
let timeEqual = firstDate.time == secondDate.time
Much simpler than accepted answer:
SWIFT 4
// date1 and date2 are the dates you want to compare
let calendar = Calendar.current
var newDate = Date(TimeIntervalSinceReferenceDate: 0) // Initiates date at 2001-01-01 00:00:00 +0000
var newDate1 = Date(TimeIntervalSinceReferenceDate: 0) // Same as above
// Recieving the components from the dates you want to compare
let newDateComponents = calendar.dateComponents([.hour, .minute], from: date1)!
let newDate1Components = calendar.dateComponents([.hour, .minute], from: date2)!
// Adding those components
newDate = calendar.date(byAdding: newDateComponents, to: newDate)
newDate1 = calendar.date(byAdding: newDate1Components, to: newDate1)