ISO 8601 Week Year Snippets

weekyear.py

#!/usr/bin/env jython

# Test standard Java classes

from java.text import *
from java.lang import *

fmty = SimpleDateFormat('yyyy-MM-dd')
date = fmty.parse('2015-12-27', ParsePosition(0))
print fmty.format(date, StringBuffer(), FieldPosition(0))  # 2015-12-27

fmtY = SimpleDateFormat('YYYY-MM-dd')
print fmtY.format(date, StringBuffer(), FieldPosition(0))  # 2016-12-27

weekyear.swift

//: Playground - noun: a place where people can play

import UIKit

let fmty = NSDateFormatter()
fmty.dateFormat = "yyyy-MM-dd"
let date = fmty.dateFromString("2015-12-27")
fmty.stringFromDate(date!) // "2015-12-27"

let fmtY = NSDateFormatter()
fmtY.dateFormat = "YYYY-MM-dd"
fmtY.stringFromDate(date!) // "2016-12-27"