Kronos is an NTP client library written in Swift. It supports sub-seconds precision and provides a stable monotonic clock that won't be affected by changes in the clock.

Example app

This is an example app that displays the monotonic

Clock.now

Usage

Sync clock using a pool of NTP servers

Calling

Clock.sync

time.apple.com

Clock

Clock.sync { date, offset in
    // This is the first sync (note that this is the fastest but not the
    // most accurate run
    print(date)
}

Get an NTP sync'ed date

Clock.now

NSTimer.scheduledTimerWithTimeInterval(1.0, target: self,
                                       selector: #selector(Example.tick),
                                       userInfo: nil, repeats: true)

@objc func tick() {
    print(Clock.now) // Note that this clock will get more accurate as
                     // more NTP servers respond.
}

Installation

Embedded frameworks require a minimum deployment target of iOS 8 or OS X Mavericks (10.9).

CocoaPods

CocoaPods is a dependency manager for Cocoa projects. You can install it with the following command:

$ gem install cocoapods

CocoaPods 0.39.0+ is required to build Kronos.

To integrate Kronos into your Xcode project using CocoaPods, specify it in your

Podfile

platform :ios, '8.0'
use_frameworks!

pod 'Kronos'

Then, run the following command:

$ pod install

Swift package manager (experimental)

Swift PM is a tool for managing distribution of source code.

To integrate Kronos into your project using Swift PM use:

$ export SWIFT_EXEC=/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swiftc
$ swift build

Carthage

Carthage is a decentralized dependency manager for Cocoa. You can install it by following the instructions here.

To integrate Kronos into your project using Carthage, specify it in your

Cartfile

github "MobileNativeFoundation/Kronos"

Then, run the following command:

$ carthage update

Looking for Kronos for your Android application? Check out Kronos for Android