Is it possible to subtract days, months or years from current date in swift

Question

Hello I want to subtract days, months or a year from my current date. I can use this code to create a date which is one week away from the current date.

let date = Date().addingTimeInterval(TimeInterval(86400*7))

Is it possible to create a date which is one week in the past from the current date?

Answer 1

You should use Calendar to do these calculations instead of hard coding 86400 for a day.

if let date = Calendar.current.date(byAdding: .day, value: -7, to: Date()) {
   // Use this date
}

Answer 2

Swift 5

Function to add or subtract day, month, year from current date.

func addOrSubtractDay(day:Int)->Date{
  return Calendar.current.date(byAdding: .day, value: day, to: Date())!
}

func addOrSubtractMonth(month:Int)->Date{
  return Calendar.current.date(byAdding: .month, value: month, to: Date())!
}

func addOrSubtractYear(year:Int)->Date{
  return Calendar.current.date(byAdding: .year, value: year, to: Date())!
}

Now calling the function

//Subtracting
var daySubtractedDate = addOrSubtractDay(-7)
var monthSubtractedDate = addOrSubtractMonth(-7)
var yearSubtractedDate = addOrSubtractYear(-7)

//Adding
var dayAddedDate = addOrSubtractDay(7)
var monthAddedDate = addOrSubtractMonth(7)
var yearAddedDate = addOrSubtractYear(7)

• To Add date pass prospective value
• To Subtract pass negative value