[squeak-dev] Timespan>>datesDo: - is this a bug?

Levente Uzonyi leves at caesar.elte.hu
Fri May 10 22:40:12 UTC 2019

On Fri, 10 May 2019, Chris Cunningham wrote:

> So, this code:   Date today asMonth datesDo: [:date| Transcript cr; show: date yyyymmdd]
> prints out each day in the month.  That is what I'd expect.
> This code:
>   |mth|
>   mth := Date today asMonth.
>   (mth start asDate to: mth end asDate) datesDo: [:date| Transcript cr; show: date yyyymmdd]
> does not print the last date.
> This has bitten me.  If I add a nanosecond onto the end date (mth end asDate + 1) it does include the last date - but that is ugly.  And dangerous if I have other code that carefully picks the following date start to work around this oddity.
> Thoughts?

I wrote a mail about this just two months ago[1]. Timespan, unlike 
Interval, is a right-open interval. It has to be in order to have the 
expected length. Date(Timespan) >> #to: will create a Timespan.


[1] http://forum.world.st/Testing-out-new-UTCDateAndTime-in-Squeak-5-3-alpha-td5096623.html

> -cbc

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