What day of the week was that cover posted ?
 
THE  PERFECT  PERPETUAL  CALENDAR
All dates from 1582 onwards available in full year view

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Dates shown in thin type are leap years
(Before 1582, the Gregorian Calendar had not been adopted in any part of the world.)

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1500's
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1600's
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1660	1661	1662	1663	1664	1665	1666	1667	1668	1669
1670	1671	1672	1673	1674	1675	1676	1677	1678	1679
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1700's
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1790	1791	1792	1793	1794	1795	1796	1797	1798	1799
1800's
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1900's
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2000's
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Single calculation ---- What day of the week is that? Year: Month number: Day: That isday.

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