Julian Period Day − 38
GPD = JPD - 38
Julian Period Day ÷ 365.25
JPY = JPD / 365.25
To convert from the Julian Period Day to the Julian-1 (not the Julian Period) Year...
(Julian Period Day ÷ 365.25) − 4712
Julian-1-Year = (JPD / 365.25) - 4712
To convert from the Julian Period Day to the Gregorian Period (not the Gregorian of the Christian Era) Year...
(Julian Period Day − 38) ÷ 365.24218967
GPY = (JPD - 38) / 365.24218967
To convert from the Julian Period Day to the Gregorian (not the Gregorian Period) Year...
((Julian Period Day − 38) ÷ 365.24218967) − 4712
Gregorian-Year = ((JPD - 38) / 365.24218967) - 4712
Note: the results for computing the Gregorian Calendar Year and the Gregorian Calendar Day of the Year may not always match the actual day of the year used on the Gregorian (Christian Era) calendar for the Julian Period Day that the Gregorian date is associated with.
If you want to count up from the first day of the year with Day one instead of Day zero, just add one to the answer.
To convert from the Julian Period Day to the Julian Period (not the Julian-1) Day of The Year...
Julian Period Day − (INT(Julian Period Day ÷ 365.25) × 365.25)
JPDY = JPD - (INT(JPD / 365.25) * 365.25)
To convert from the Julian Period Day to the Julian-1 (not the Julian Period) Calendar Day of The Year...
Use the same formula above since the years for both the Julian Period and Julian-1 calendars change years on the same date.
To convert from the Julian Period Day to the Gregorian Period (not the Gregorian of the Christian Era) Day of The Year...
INT(Julian Period Day − 38) − (INT((Julian Period Day − 38) ÷ 365.24218967) × 365.24218967))
GPDY = (JPD - 38) - (INT((JPD - 38) / 365.24218967) * 365.24218967))
To convert from the Julian Period Day to the Gregorian (not the Gregorian Period) Day of The Year...
Use the same formula above since the years for both the Gregorian Period and Gregorian Era calendars change years on the same date.
Note: the results for computing the Gregorian Calendar Year and the Gregorian Calendar Day of the Year may not always match the actual day of the year used on the Gregorian (Christian Era) calendar for the Julian Period Day that the Gregorian date is associated with.
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