At a guess, it’s because at that time of year, British Summer Time is active; 
so 00:00 on 14th August local time is 23:00 on 13th August GMT. 

Jeremy


> On 8 Feb 2019, at 14:32, Uist Macdonald via 4D_Tech <4d_tech@lists.4d.com> 
> wrote:
> 
> 
> I do not understand what is happening here in V17.0:
> 
> String(Date("14/8/2017");ISO date GMT) //UK date format
> 
> gives
> 
> 2017-08-13T23:00:00Z
> 
> i.e. the day before!
> 
> My regional setting are correct.
> 
> Uist



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