Calendars & Dates » Old Style & New Style: Julian to Gregorian

Convert between Old & New Style dates

Date/Calendar Changes - PolandGenWeb

Double Dating: Julian Calendar or Gregorian Calendar | Ancestry (YouTube) ^FREE

By Crista Cowan

GenWiki - Gregorianischer Kalender / Gregorian Calendar

This article on the GenWiki gives the dates when various areas changed from the Julian calendar to the Gregorian calendar.

Gregorian Calendar (Wikipedia)

Julian Calendar (Wikipedia)

Old Style - New Style Reference

By entering any year, a side-by-side calendar is generated showing the Old Style dates on top with the New Style dates on the bottom for each day of the week for each month of the year. Very handy for counting days in one Style or the other but this calendar calculator does not include any Style change over information.

Old Style and New Style Dates (Wikipedia)

Old Style and New Style Dates and the Change to the Gregorian Calendar - A Summary for Genealogists

By Mike Spathaky.

Perpetual Calendar

Provides a brief explanation of the switch from Gregorian to Julian. Also gives a very detailed table which shows by nation and district, when the change from Old Style to New Style happened. This table is extremely useful.

The Gregorian Conversion | Polysyllabic

Background information from A History of the Western Calendar.

Understanding the Dates Used in Early English, Irish and Quaker Records