So a birth recorded in the period between 1st January and 25th March is shown as (e.g.) 3rd March 1733/4 to show that that the date intended was in March of the Civil Year 1733 and the Historical Year 1734, that is, the month before April 1734.

There are other complications to do with calculation of leap years, and changeover from Julian to Gregorian calendars, but I believe I've covered the primary usage of 'double dates'.

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A "best before" date tells you when the "durable life" period ends.

Best before date - The "best before" date does not guarantee product safety, but it does give you information about the freshness and potential shelf-life of the unopened food you are buying.

The thought that a member of the Skipwith family became a Quaker martyr and her daughter would come to the states, seemed very far-fetched. Two weeks ago, a cousin of Michael's contacted me and I gave her my research for the lines she shared with Michael. A quick search of google books found this article from 8 (1904/5):188-89: The Skipwiths and the Quakers. Then I went to the British National Archives to their Non-Conformist Parish Registers Database. She was the daughter of Willoughby Skipwith and Honora Saunders.

There I obtained (for five pounds) the actual marriage record of George Goforth and Anne Skipwith from 1662. This last couple is clearly given in Maddison's Lincolnshire Pedigrees, III: 896. Through Willougby Skipwith, there is a double descent from Edward III.

A double date comes from the transition from the Julian calendar to the Gregorian calendar.

According to the Julian calendar, the first day of the year was March 25 and each year was 365 days and 6 hours long.

After the expiration date, the food may not have the same nutrient content declared on the label.

If the expiration date has passed, throw away the food.

Use by date - This may appear instead of "best before" on pre-packaged fresh yeast only.

Expiration date - This must appear on formulated liquid diets, foods for use in a very low-energy diet, meal replacements, nutritional supplements and infant formulas.

I'm well acquainted with medieval families so seeing the name Skipwith, I immediately thought royal line. However, the is presented in narrative form without any footnotes.