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POWhy are Rails Weekday indexes different than Ruby's?
 

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  1. POWhy are Rails Weekday indexes different than Ruby's?
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    <p>in Rails 3.0.10 </p> <pre><code>ruby-1.9.2-p180 :010 &gt; Time::DAYS_INTO_WEEK =&gt; {:monday=&gt;0, :tuesday=&gt;1, :wednesday=&gt;2, :thursday=&gt;3, :friday=&gt;4, :saturday=&gt;5, :sunday=&gt;6} </code></pre> <p>And </p> <pre><code>ruby-1.9.2-p180 :011 &gt; Date.today =&gt; Mon, 10 Oct 2011 ruby-1.9.2-p180 :012 &gt; Date.today.wday =&gt; 1 </code></pre> <p>So, Monday is 0 in the Time mapping, and 1 in the Date mapping.<br> <a href="https://github.com/rails/rails/blob/master/activesupport/lib/active_support/core_ext/time/calculations.rb" rel="noreferrer">https://github.com/rails/rails/blob/master/activesupport/lib/active_support/core_ext/time/calculations.rb</a></p> <p>I feel like starting with Sunday as zero is the safer, more common, more likely to be understood by someone else way to do things. I was hoping to understand the history / reasoning in case I overlook something.</p> <p>My use case: I'm storing day of week explicitly in my db. I figured storing as an integer would be more efficient and easier to work with than storing "Monday", "Tuesday", etc.</p> <p>PS I had the great idea to do something like the following. Map back and forth from weekday strings inside methods (hiding the integer).</p> <pre><code>ruby-1.9.2-p180 :010 &gt; Time::DAYS_INTO_WEEK =&gt; {:monday=&gt;0, :tuesday=&gt;1, :wednesday=&gt;2, :thursday=&gt;3, :friday=&gt;4, :saturday=&gt;5, :sunday=&gt;6} Time::DAYS_INTO_WEEK[day_of_week.downcase.to_sym] Time::DAYS_INTO_WEEK.to_a.select{|k, v| v == start_day }.first.first.to_s.capitalize </code></pre>
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    1. CODon't know why the indexes are the way they are, but running `Date.today.wday` in `irb` as well as `rails c` both report the same week day (i.e. 1 for Monday). Same result with `Time.now.wday`. Also you might find this [bit of information](http://makandra.com/notes/1074-deal-with-different-ways-of-counting-weeks-and-weekdays-in-ruby) useful.
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    2. COYou are correct. The 'issue' I have is that there is an accessible mapping which is inconsistent. I was hoping to use an internal hash for my mapping. (and thanks for the link)
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    3. COAnd in rails they are actually constant - http://api.rubyonrails.org/classes/Date.html I was expecting to have a setting for picking up start of week.
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