Date.prototype.toISOString and Invalid Date

Allen Wirfs-Brock Allen.Wirfs-Brock at
Wed Jun 10 11:07:20 PDT 2009

Date.prototype.toJSON is defined (using pseudo code) to be generally equivalent to
               return this.toISOString();

From: Mark S. Miller [mailto:erights at]
Sent: Wednesday, June 10, 2009 11:04 AM
To: Allen Wirfs-Brock
Cc: Brendan Eich; es5-discuss at; es-discuss at
Subject: Re: Date.prototype.toISOString and Invalid Date

On Wed, Jun 10, 2009 at 11:00 AM, Allen Wirfs-Brock <Allen.Wirfs-Brock at<mailto:Allen.Wirfs-Brock at>> wrote:
This would also imply that (new Date(NaN).toJSON()) also throws.  Is everybody fine with that??

I must be missing something. How does that follow?

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