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@johnhatvani
Last active March 15, 2023 10:12
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Swift Playground #1 adding components to Date using operator overloading.
import Foundation
extension Int{
var day: (Int, Calendar.Component) {
return (self, .day)
}
var month: (Int, Calendar.Component) {
return (self, .month)
}
var year: (Int, Calendar.Component) {
return (self, .year)
}
}
////
public func + (date: Date, tuple: (value: Int, unit: Calendar.Component)) -> Date {
return Calendar.current.date(byAdding: tuple.unit, value: tuple.value, to: date)!
}
public func - (date: Date, tuple: (value: Int, unit: Calendar.Component)) -> Date {
return Calendar.current.date(byAdding: tuple.unit, value: (-tuple.value), to: date)!
}
public func += (date: inout Date, tuple: (value: Int, unit: Calendar.Component)) {
date = Calendar.current.date(byAdding: tuple.unit, value: tuple.value, to: date)!
}
public func -= (date: inout Date, tuple: (value: Int, unit: Calendar.Component)) {
date = Calendar.current.date(byAdding: tuple.unit, value: (-tuple.value), to: date)!
}
var tomorrow = Date() + 1.year
tomorrow += 1.day
var yesterday = Date() - 1.day
yesterday -= 1.year
@aflondono
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I like these overloaded operations. Very nice.

What is the last argument options: NSCalendarOptions.SearchBackwards in dateByAddingUnit?
I was looking around, and I see that other people in similar answers use options: NSCalendarOptions(0), or options: nil, but no one explains what it does. And I cannot find it in Apple's documentation.

@johnhatvani
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Author

Ive updated this to bring it into swift 1.2 and taken derrh input to add and extension on Int to make the end api cleaner.

As for the Calendar option I have changed it to the only one documented by apple. Which added no real impact on the return of the method

@eonist
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eonist commented Jan 13, 2017

Swift 3 doesn't have dateByAddingUnit.

`dateByAddingUnitseems to have been replaced by:Calendar.current.date(byAdding: .day, value: days, to: date)!`` Although, I can't find options anymore?

@FilDevTronic
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It's fixed now.

@stevestevensonneds
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This is the worst code I've ever seen

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