Core Data Predicate Filter By Today’s Date

by

You can’t simply use to compare your date to today’s date:

let today = Date()
let datePredicate = NSPredicate(format: "%K == %@", #keyPath(ModelType.date), today)

It will show you nothing since it’s unlikely that your date is the EXACT comparison date (it includes seconds & milliseconds too)

The solution is this:

// Get the current calendar with local time zone
var calendar = Calendar.current
calendar.timeZone = NSTimeZone.local

// Get today's beginning & end
let dateFrom = calendar.startOfDay(for: Date()) // eg. 2016-10-10 00:00:00
let dateTo = calendar.date(byAdding: .day, value: 1, to: dateFrom)
// Note: Times are printed in UTC. Depending on where you live it won't print 00:00:00 but it will work with UTC times which can be converted to local time

// Set predicate as date being today's date
let fromPredicate = NSPredicate(format: "%@ >= %K", dateFrom as NSDate, #keyPath(ModelType.date))
let toPredicate = NSPredicate(format: "%K < %@", #keyPath(ModelType.date), dateTo as NSDate)
let datePredicate = NSCompoundPredicate(andPredicateWithSubpredicates: [fromPredicate, toPredicate])
fetchRequest.predicate = datePredicate

It’s by far the easiest & shortest way of showing only objects which have today’s date.

More Related Contents:

  1. How to apply the type to a NSFetchRequest instance?
  2. SwiftUI View and @FetchRequest predicate with variable that can change
  3. Swift 3 incorrect string interpolation with implicitly unwrapped Optionals
  4. Waiting until the task finishes
  5. round trip Swift number types to/from Data
  6. How can I create instances of managed object subclasses in a NSManagedObject Swift extension?
  7. What is the ‘open’ keyword in Swift?
  8. Non-‘@objc’ method does not satisfy optional requirement of ‘@objc’ protocol
  9. Shuffle array swift 3
  10. What is a good example to differentiate between fileprivate and private in Swift3
  11. How to create managedObjectContext using Swift 3 in Xcode 8?
  12. Swift 3 for loop with increment
  13. Choosing CoreData Entities from form picker
  14. Swift 3 first parameter names
  15. Express for loops in swift with dynamic range
  16. Swift 3 Core Data Delete Object
  17. What happened to the UIView?() constructor in Swift 3.0?
  18. Swap rootViewController with animation?
  19. Knowing where retain cycles are and removing them
  20. Whither dispatch_once in Swift 3?
  21. Saving Picked Image to CoreData
  22. Xcode 8 / Swift 3 : Simple UIPicker code not working
  23. try, try! & try? what’s the difference, and when to use each?
  24. print without newline in swift
  25. Convert Swift Array to Dictionary with indexes [duplicate]
  26. Swift3 optionals chaining in IF conditions bug?
  27. How can I disambiguate a type and a module with the same name?
  28. How to get user home directory path (Users/”user name”) without knowing the username in Swift3
  29. Swift find all occurrences of a substring
  30. Whats the Swift animate WithDuration syntax?

Leave a Comment