Historical English Calendar
By TouchText LLC
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Historical English Calendar is a streamlined offline date-calculator for those interested in English history, literature, and genealogy. It converts between Old and New Style dates (Gregorian and Julian), calculates the day of the week, identifies the dates of moveable holidays (Easter, etc.), and calculates regnal years through queen Victoria.
Date calculations are also accurate for European history outside of Great Britain, before 1582 and after 1752.
So glad I found this app. As someone who often does research in the 13-14th centuries, this will allow me to quickly figure out what year a document is dated.