How to do ISO 8601 in various languages (2015-01-14T20:55).

_iso8601.md

xkcd 1179

iso8601.js

//http://goo.gl/M4x8JR
function pad(num, size) {
  var s = num + "";
  while (s.length < size) s = "0" + s;
  return s;
}

function isoTime() {
  var t = new Date();
  var y = t.getFullYear();
  var m = pad(t.getMonth() + 1, 2);
  var d = pad(t.getDate(), 2);
  var h = pad(t.getHours(), 2);
  var i = pad(t.getMinutes(), 2);
  var date = y + "-" + m + "-" + d + "T" + h + ":" + i; //colon optional
  return date;
}

//Updates div with time every 15 seconds
window.setInterval(function(){
  $("#date").html(isoTime());
}, 15000);

iso8601.php

<?php
#http://goo.gl/r0vRAD
echo date("Y-m-d\TH:i", time()); #colon optional

iso8601.py

#http://goo.gl/GjJQpU
import time
print time.strftime("%Y-%m-%dT%H:%M") #colon optional

iso8601.rb

#http://goo.gl/GUWFdd
def pad (num, size)
  s = num.to_s
  while s.length < size do
    s = "0" + s
  end
  return s
end

def isoTime ()
  time = Time.new
  y = time.year.to_s
  m = pad(time.month, 2)
  d = pad(time.day, 2)
  h = pad(time.hour, 2)
  i = pad(time.min, 2)
  date = y + "-" + m + "-" + d + "T" + h + ":" + i #colon optional
  return date
end

puts isoTime()