# Newbie: dates by week and year

**URL:** <https://www.ruby-forum.com/t/newbie-dates-by-week-and-year/57156>\
**Category:** Ruby\
**Created:** [April 7, 2006, 4:21pm UTC](https://www.ruby-forum.com/t/newbie-dates-by-week-and-year/57156 "2006-04-07T16:21:21Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Jeroen\_van\_Doorn](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/49beb7/32.png) [@Jeroen\_van\_Doorn](https://www.ruby-forum.com/u/Jeroen_van_Doorn)\
**Post date:** [April 7, 2006, 4:21pm UTC](https://www.ruby-forum.com/t/newbie-dates-by-week-and-year/57156/1 "2006-04-07T16:21:21Z")

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Hi Everybody,

Am a newbie to ruby, so forgive me if this is a stupid question,

I’m looking for a way to get a series of dates (monday - sunday or  
sunday - saturday) , but I’m only having  
the year and the week number…

Hopefully someone can help,  
Kind regards,  
Jeroen van Doorn

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**Author:** ![Jeroen\_van\_Doorn](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/49beb7/32.png) [@Jeroen\_van\_Doorn](https://www.ruby-forum.com/u/Jeroen_van_Doorn)\
**Post date:** [April 7, 2006, 4:36pm UTC](https://www.ruby-forum.com/t/newbie-dates-by-week-and-year/57156/2 "2006-04-07T16:36:37Z")

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Jeroen van Doorn wrote:

> Jeroen van Doorn

[http://www.rubycentral.com/book/ref\_c\_time.html#Time.strftime](http://www.rubycentral.com/book/ref_c_time.html#Time.strftime)

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<div class="post-metadata">

**Author:** ![Jeroen\_van\_Doorn](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/49beb7/32.png) [@Jeroen\_van\_Doorn](https://www.ruby-forum.com/u/Jeroen_van_Doorn)\
**Post date:** [April 7, 2006, 4:42pm UTC](https://www.ruby-forum.com/t/newbie-dates-by-week-and-year/57156/3 "2006-04-07T16:42:50Z")

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On Fri, 7 Apr 2006, Jeroen van Doorn wrote:

> Jeroen van Doorn  
> this ought to get you going:

```
 harp:~ > cat a.rb
 require 'date'

 def weekno year, week
   jjj = (7 * (week - 1)) + 1
   jd = Date.ordinal_to_jd year, jjj
   yyyy, m, d = Date.jd_to_civil jd
   a = Date.new yyyy, m, d
   b = Date.new yyyy, m, d + 7
   (a ... b)
 end

 first = weekno 2006, 1
 p first.map{|day| day.to_s}

 second = weekno 2006, 2
 p second.map{|day| day.to_s}

 third = weekno 2006, 3
 p third.map{|day| day.to_s}

 harp:~ > ruby a.rb
 ["2006-01-01", "2006-01-02", "2006-01-03", "2006-01-04", 

```

“2006-01-05”, “2006-01-06”, “2006-01-07”]  
[“2006-01-08”, “2006-01-09”, “2006-01-10”, “2006-01-11”,  
“2006-01-12”, “2006-01-13”, “2006-01-14”]  
[“2006-01-15”, “2006-01-16”, “2006-01-17”, “2006-01-18”,  
“2006-01-19”, “2006-01-20”, “2006-01-21”]

regards.

-a

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<div class="post-metadata">

**Author:** ![Jeroen\_van\_Doorn](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/49beb7/32.png) [@Jeroen\_van\_Doorn](https://www.ruby-forum.com/u/Jeroen_van_Doorn)\
**Post date:** [April 10, 2006, 10:16am UTC](https://www.ruby-forum.com/t/newbie-dates-by-week-and-year/57156/4 "2006-04-10T10:16:51Z")

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Thanks for the answer!

This one really gave me a headache …

Kind regards,  
Jeroen van Doorn