Plus Deutsch is German for German, henceforth the explaination on why the Pennsylvania Dutch are called that when they are really German and not Dutch. The Dutch from the Netherlands also got their ethnic name derived from the German term Deutsch as well believe it or not. If you're Dutch, then you are from Denmark.
1 Deadline for filing a 2015 personal, partnership, or calendar year estates/trusts tax returns or extension.  The return or extension must be postmarked or transmitted for e-filing by Monday, April 18, 2016 (April 19 for Maine and Massachusetts residents).
In some years, Emancipation Day may be the reason to extend the deadline for filing an income tax return (Tax Day). In 2007, the observance Emancipation Day in Washington DC had the effect of nationally extending the 2006 income tax filing deadline from April 16 to April 17.