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Dates Are CriticalDates Are Critical To Your Family Tree Dates are a critical part of family tree research. Making sure that we understand and verify the dates that we are recording is an important part of the historian's duties. To understand the formats that dates have taken over the centuries, we need to look at two basic problems. The first problem related to the first day of the new year. Early calendars were based on the Feast of the Annunciation, the 25th of March, representing the first day of the new year. In the 1522, Venice introduced January 1st as the first day of the new year. Other countries in Europe, made this change over the next 200 years. The dates that other countries converted are as follows:
The second problem was created when the Julian calendar was introduced in 46 BC. The Julian calendar was based on 365 days for 3 years and the fourth year was 366 days. By the late 16th-century the calendar was out of step with the seasons by about 10 days. In 1582, Pope Gregory XIII replaced the Julian calendar with the Gregorian calendar. This calendar dropped 10 days from the month of October, for the first year only, to bring this calendar in line with the seasons. In addition to retaining every fourth year as a leap year, the new calendar dropped the leap year for every century year that was not divisible by 400. This change helped keep the accumulation problem from reoccurring. The Gregorian calendar also showed January 1st as the first day of the new year.
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