HELP WITH A NEW YORK CHART

1
Hi,

Can anyone please clear something up for me. I drew up a chart using Solar Fire for 18th April 2005 in New York, NY and according to this, it was not yet Summer Time in New York as the chart was 5 hours behind GMT. I was comparing the chart with the same chart someone else had drawn up yet his was different and I worked out that his source reckoned it was summer time as it was 4 hours behind GMT.

I double checked this on Astrodienst which backed up the other person's chart, i.e Summer Time in New York, 4 hours behind.

Does anyone know when Summer Time actually begain in New York this year?

Thanks.
Susan,
Edinburgh.
www.horaryqueen.co.uk