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Old Calendars - Look up any date in the past
Convert between Old & New Style dates - aulis.org
Perpetual Calendar Index (1801 - 2100) - Accuracy Project
Old Style and New Style dates - Wikipedia
Calendar for Year 1900 (United States) - timeanddate.com
Julian to Gregorian Calendar: How We Lost 10 Days - timeanddate.com
Create a Calendar for any Year from 1AD to 9999AD - HCI Data
Historical Calendar
Sept. 22, 1792: Day One of Revolutionary Calendar | WIRED
Historical Events on September 22 - On This Day