PostTime
The PostTime object can tell you how long ago from your given timestamp.
Tutuorial of how I created PostTime with TDD
Installation
To integrate PostTime into your Xcode project using CocoaPods, specify it in your Podfile:
source 'https://github.com/CocoaPods/Specs'
use_frameworks!
target '<Your Target Name>' do
    pod 'PostTime'
endThen, run the following command:
$ pod install
Usage
You'll need to import PostTime in swift files.
deviceID
This deviceID comes from keychain.
let postTime = PostTime(postDate: Date().timeIntervalSince1970 - 5.0)
print(postTime.howLongAgo())
// => 5 sec.License
Copyright 2018 David Wu