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LAST UPDATED: 07 Apr, 2022 232 PEOPLE USED
Answer By: Thomas Strickland
alternatively, you can use the built-in date object to get the Julian date from Gregorian date by adding the Julian date of Gregorian absolute date 0 which is 1,721,425 to ordinal date as published here: >>> from datetime import date >>> date (1970, 1, 1).toordinal () + 1721425 2440588. The second solution is simpler and much faster.
Answer By: Kenneth Meidinger
The Julian Day number is the number of days elapsed since noon (12:00) on January 1, 4713 BC The Modified Julian Day number is the number of days since midnight (00:00) on November 17, 1858 AD (MJD=JD-2400000.5) The Gregorian calendar is used for dates on and after October 15, 1582 AD and the Julian calendar is used before October 4, 1582.
Subtract 10 days to account for the changeover in calendar type from Julian to Gregorian in 1582. Count the number of days between January 1 and your current day of year. For example, if the date you're converting is February 28, there are 59 days between January 1 and February 28.
Mostly 5 digits number of Julian formats is used where the first 2 digits represent the year and the last 3 digits represent the day of the year. In Excel, to convert a date to Julian format with 5 digits number, we need to use the following formula in cell C2 as per our example; =RIGHT (YEAR (B2),2)&TEXT (B2-DATE (YEAR (B2),1,0),"000")
Method 1 of 2: Reading JD on Packaged FoodLocate the 3-7 digit number stamped on your food. Packaged food items sometimes have "Julian Dates" stamped on them that represent the packing date.Find the year by looking at the first 2 digits if the number is 5 digits long. ...Find the year from the first 4 digits if the number has 7 digits. ...Convert the last 3 digits to the calendar day. ...
The Gregorian calendar, which is the calendar used today, was first introduced by Pope Gregory XIII via a papal bull in February 1582 to correct an error in the old Julian calendar. This error had been accumulating over hundreds of years so that every 128 years the calendar was out of sync with the equinoxes and solstices by one additional day.
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