Skip to content

Instantly share code, notes, and snippets.

Embed
What would you like to do?
Ruby International Date Parser
# -*- coding: utf-8 -*-
#
# Purpose:
# Extend the date parsing capabilities of Ruby to work with dates with international month names.
#
# Usage:
#
# Date.parse_international(date_string)
# DateTime.parse_international(date_string)
# date_string.to_international_date
#
# Notes:
# 1) This routine works by substituting your local month names (as defined by Date::MONTHNAMES) for the
# international names when they occur in the date_string.
# 2) As distributed, this code works for French, German, Italian, and Spanish. You must add the month
# names for any additional languages you wish to handle.
#
class Date
def self.parse_international(string)
parse(month_to_english(string))
end
private
def self.make_hash(names)
names.inject({}) {|result, name| result[name] = MONTHNAMES[result.count+1] ; result }
end
MONTH_TRANSLATIONS = {}
MONTH_TRANSLATIONS.merge! make_hash(%w/janvier février mars avril mai juin juillet août septembre octobre novembre décembre/) # French
MONTH_TRANSLATIONS.merge! make_hash(%w/Januar Februar März April Mai Juni Juli August September Oktober November Dezember/) # German
MONTH_TRANSLATIONS.merge! make_hash(%w/gennaio febbraio marzo aprile maggio giugno luglio agosto settembre ottobre novembre dicembre/) # Italian
MONTH_TRANSLATIONS.merge! make_hash(%w/enero febrero marzo abril mayo junio julio agosto septiembre octubre noviembre diciembre/) # Spanish
def self.month_to_english(string)
month_from = string[/[^\s\d,]+/i] # Search for a month name
if month_from
month_to = MONTH_TRANSLATIONS[month_from.downcase] # Look up the translation
return string.sub(month_from, month_to.to_s) if month_to
end
return string
end
end
class DateTime
def self.parse_international(string)
parse(Date::month_to_english(string))
end
end
class String
def to_international_date
Date::month_to_english(self).to_date
end
end
@Jan-Zeiseweis
Copy link

Jan-Zeiseweis commented Apr 30, 2013

You have to downcase the german monthnames to make it work for german months.

Also you could also make the hash like this:

def self.make_hash(names)
  Hash[([nil]+names).zip(MONTHNAMES)]
end

@greutter
Copy link

greutter commented Dec 15, 2016

Hi Jckrg,

Seems like you contribution is part of Ruby 2.3.0, find an issue in spanish parsing

At least for spanish this is solved changing line 37
From:

37: month_from = string[/[\s\d,]+/i]

To:

37: month_from = string[/[a-z]+/i]

Regards

@duerst
Copy link

duerst commented Jan 1, 2017

@greutter: This file is NOT part of Ruby. See https://bugs.ruby-lang.org/issues/13036. In addition, your fix will not work for French (it will fail for the accented month names février, août, and décembre).

@thpramos
Copy link

thpramos commented Mar 5, 2017

Just to add to your code if you want! :)
MONTH_TRANSLATIONS.merge! make_hash(%w/Janeiro Fevereiro Março Abril Maio Junho Julho Agosto Setembro Outubro Novembro Dezembro/) # Pt-BR

@CrazybutSolid
Copy link

CrazybutSolid commented Apr 9, 2020

Newbie question: where would I place this? In /lib?

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment