Unable to check time elapsed with Calendar.current.dateComponents

Question

I want to check how many seconds passed since one timestamp to now. I have this:

Calendar.current.dateComponents([.second], from: userInfo?["timestamp"], to: Date()).second! > preferences["secsToWait"]

But I'm getting this error:

Type 'Any' has no member 'second'

Changing the code to this:

Calendar.current.dateComponents([Calendar.Component.second], from: userInfo?["timestamp"], to: Date()).second! > preferences["secsToWait"]

changes the error message to:

Cannot invoke 'dateComponents' with an argument list of type '([Calendar.Component], from: Any?, to: Date)'

I do have this on top:

import Foundation;

This code is called inside SafariExtensionHandler (if it matters). Any idea of what's causing it?

score 1 · Accepted Answer · answered Dec 06 '19 at 20:30

You are getting this error because userInfo is of type [AnyHashable : Any]. This means that the result of userInfo?["timestamp"] is of type Any?. Without seeing how you are storing that info I assume you are actually passing a Date object in, in which case you need to unwrap the timestamp before you can use it. The safest way would be:

if let timestamp = userInfo?["timestamp"] as? Date {
  //Do whatever you were going to do with
  Calendar.current.dateComponents([.second], from: timestamp, to: Date()).second! > preferences["secsToWait"]
}

You could also just do:

//This will crash if the value is nil or if it's not actually a Date
Calendar.current.dateComponents([.second], from: userInfo!["timestamp"] as! Date, to: Date()).second! > preferences["secsToWait"]

Unable to check time elapsed with Calendar.current.dateComponents

1 Answers1