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-   -   Time.parse of empty string returns Time.now? (http://www.velocityreviews.com/forums/t832624-time-parse-of-empty-string-returns-time-now.html)

Peter Krantz 08-20-2006 09:07 PM

Time.parse of empty string returns Time.now?
 
Hi!

I am Ruby newbie and have a question regarding Time.parse(). I am
using Time.parse to scan arbitrary strings for a datetime value. When
I feed strings that have no datetime value in them Time.parse seems to
return Time.now.

How can I check if my string has a datetime value in it? I would
rather have Time.parse return nil if there wasn't any value in the
string. Right now it seems like I am unable to tell if there was a
datetime fragment in the string or not. There is no way to say if the
string contained a datetime value == now or if it was empty.

Example:

> reactor_shutdown = Time.parse("Never")

=> Sun Aug 20 23:05:33 CEST 2006

Regards,

Peter


Logan Capaldo 08-20-2006 09:23 PM

Re: Time.parse of empty string returns Time.now?
 

On Aug 20, 2006, at 5:07 PM, Peter Krantz wrote:

> Hi!
>
> I am Ruby newbie and have a question regarding Time.parse(). I am
> using Time.parse to scan arbitrary strings for a datetime value. When
> I feed strings that have no datetime value in them Time.parse seems to
> return Time.now.
>
> How can I check if my string has a datetime value in it? I would
> rather have Time.parse return nil if there wasn't any value in the
> string. Right now it seems like I am unable to tell if there was a
> datetime fragment in the string or not. There is no way to say if the
> string contained a datetime value == now or if it was empty.
>
> Example:
>
>> reactor_shutdown = Time.parse("Never")

> => Sun Aug 20 23:05:33 CEST 2006
>
> Regards,
>
> Peter
>


This is a bit of a hack but:

def parse_time(s)
if Date._parse(s).empty?
nil
else
Time.parse(s)
end
end

irb(main):020:0> parse_time("Never")
=> nil
irb(main):021:0> parse_time("2:00 pm")
=> Sun Aug 20 14:00:00 EDT 2006




ara.t.howard@noaa.gov 08-20-2006 10:53 PM

Re: Time.parse of empty string returns Time.now?
 
On Mon, 21 Aug 2006, Peter Krantz wrote:

> Hi!
>
> I am Ruby newbie and have a question regarding Time.parse(). I am
> using Time.parse to scan arbitrary strings for a datetime value. When
> I feed strings that have no datetime value in them Time.parse seems to
> return Time.now.
>
> How can I check if my string has a datetime value in it? I would
> rather have Time.parse return nil if there wasn't any value in the
> string. Right now it seems like I am unable to tell if there was a
> datetime fragment in the string or not. There is no way to say if the
> string contained a datetime value == now or if it was empty.
>
> Example:
>
>> reactor_shutdown = Time.parse("Never")

> => Sun Aug 20 23:05:33 CEST 2006
>
> Regards,
>
> Peter


irb(main):001:0> require 'date'
=> true

irb(main):002:0 reactor_shutdown = DateTime.parse "Never"
ArgumentError: 3 elements of civil date are necessary
from /home/ahoward//lib/ruby/1.8/date.rb:1214:in `new_with_hash'
from /home/ahoward//lib/ruby/1.8/date.rb:1258:in `parse'
from (irb):3

irb(main):003:0> reactor_shutdown = DateTime.parse "2006-00-24"
ArgumentError: invalid date
from /home/ahoward//lib/ruby/1.8/date.rb:1173:in `civil'
from /home/ahoward//lib/ruby/1.8/date.rb:1216:in `new_with_hash'
from /home/ahoward//lib/ruby/1.8/date.rb:1258:in `parse'
from (irb):4


-a
--
to foster inner awareness, introspection, and reasoning is more efficient than
meditation and prayer.
- h.h. the 14th dali lama



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