#I have an ordinal date string and I want to change it to an ordinary #date string. For example: 2005/1 should give January 1, 2005. I see #ordinal in the Date class but I need a simple example. Thanks,
i hope this is simple enough.
we want to get the year and day values fr your string
re = /(\d+)/(\d+)/ => /(\d+)/(\d+)/
rs = “2005/1” => “2005/1”
y,d=re.match(rs)[1…2] => [“2005”, “1”]
we need to convert them to integers since ordinal wants num
y = y.to_i => 2005
d = d.to_i => 1
od = Date.ordinal(y,d) => #<Date: 4906743/2,0,2299161>
Botp, Todd,
Thanks. Since I had already parsed the ordinal date’s year and day to
get
them in string sortable order, I just had to take your examples and do
this:
require ‘date’ … od = Date.ordinal (strYear.to_i, strOrdn.to_i) and
then
od.to_s gives the sortable (and readable) yyyy-mm-dd string.
Wow, Ruby is powerful, but the documentation on Date (and perhaps other
gem
filled libraries) is hard for a beginner to grok. I found Date’s ordinal
with a Google search, which gave me the built-in documentation, but no
examples. So, if I need at least the APIs for a library such as Date I
use
“ri”?
Thanks again,
Dave
PS Here’s the beginner’s way I used to parse the ordinal date string
(eg
“2005/17”):
Botp, Todd,
Thanks. Since I had already parsed the ordinal date’s year and day to get
them in string sortable order, I just had to take your examples and do this:
require ‘date’ … od = Date.ordinal (strYear.to_i, strOrdn.to_i) and then
od.to_s gives the sortable (and readable) yyyy-mm-dd string.
Wow, Ruby is powerful, but the documentation on Date (and perhaps other gem
filled libraries) is hard for a beginner to grok. I found Date’s ordinal
with a Google search, which gave me the built-in documentation, but no
examples. So, if I need at least the APIs for a library such as Date I use
“ri”?
Yeah, no examples. I guess they just expect us to learn it from them
directly
Oh, and strftime doesn’t show up in the online RDoc documentation
(http://www.ruby.org/core). Sometimes, stuff like this gets a little
frustrating so I end up using .public_methods or
.instance_methods to find out what’s cooking underneath the
hood. I understand keeping docs up to date for a relatively volatile
language like Ruby is difficult.
It does say at the top of the Date doc:
See the documentation to the file date.rb for an overview.
This is on the same page, upper left frame, called lib/date.rb. There
are a couple examples there.
ri doesn’t work on my machine for some reason. I probably just have to
reinstall it.
