1. Naoto Kaneko
Timepiece

3. @卓球ハウス

4. Timepiece
github.com/naoty/Timepiece

6. Intuitive NSDate
extensions in Swift

7. Inspired by
• ActiveSupport (Ruby)
• Moment.js (JavaScript)

8. 1 minute later (iOS 7)
let components = NSDateComponents()
components.minute = 1
NSCalendar.currentCalendar().dateByAddingComponents(
components,
toDate: now,
options: .SearchBackwards
)

9. 1 minute later (iOS 8)
NSCalendar.currentCalendar().dateByAddingUnit(
.CalendarUnitMinute,
value: 1,
toDate: now,
options: .SearchBackwards
)

10. 1 minute later (Timepiece)
now + 1.minute

11. 1 minute later (Timepiece)
1.minute.later

12. Specific date (iOS 8)
let now = NSDate()
let calendar = NSCalendar.currentCalendar()
let components = calendar.components(…, fromDate: now)
components.year = 2014
components.month = 8
components.day = 15
components.hour = 20
components.minute = 25
components.second = 43
calendar.dateFromComponents(components)

13. Specific date (Timepiece)
NSDate.date(
year: 2014,
month: 8,
day: 15,
hour: 20,
minute: 25,
second: 43
)

14. End of this month (iOS 8)
let now = NSDate()
let calendar = NSCalendar.currentCalendar()
let lastDay = calendar.rangeOfUnit(.CalendarUnitDay,
inUnit: .CalendarUnitMonth, forDate: now).length
let components = calendar.components(…, fromDate: now)
components.year = 2014
components.month = 8
components.day = lastDay
components.hour = 20
components.minute = 25
components.second = 43
calendar.dateFromComponents(components)

15. End of this month (Timepiece)
now.endOfMonth

16. Format date (iOS 8)
let threeDaysAgo = …
let formatter = NSDateFormatter()
formatter.dateFormat = “yyyy-MM-dd”
formatter.stringFromDate(threeDaysAgo)

17. Format date (Timepiece)
3.days.ago.stringFromFormat(“yyyy-MM-dd”)

18. How it works
• Int+Timepiece.swift
• 3.days -> Duration(3, .CalendarUnitDay)
• Duration.swift
• 3.days.later -> NSDate
• NSDate+Timepiece.swift
• + (lhs: NSDate, rhs: Duration) -> NSDate

19. Installation
pod “Timepiece”