Description:
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When converting Gregorian date to Julian day and then back to the Gregorian date, unexpected results can occur if the year being two digits such as (26) is entered as a four digit (0026). 

This produces a four year difference of 1461 days.

The quick solution to this is to enter four digit years such as 0026 as a literal '0026'.



Reproduce code:
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$month=3; $day=18; $year=26;
		$gregToJd=gregoriantojd($month,$day,$year);
		$gregDateFromJd=JdToGregorian($gregToJd);
		echo "month: $month, day: $day, year: $year <br>";
		echo "JulianDay from gregorian date: $gregToJd <br>";
		echo "GregorianDate from julian day: $gregDateFromJd <br>";
		$month=3; $day=18; $year=0026;
		$gregToJd=gregoriantojd($month,$day,$year);
		$gregDateFromJd=JdToGregorian($gregToJd);
		echo "month: $month, day: $day, year: $year <br>";
		echo "JulianDay from gregorian date: $gregToJd <br>";
		echo "GregorianDate from julian day: $gregDateFromJd <br>";
		$month=3; $day=18; $year='0026';
		$gregToJd=gregoriantojd($month,$day,$year);
		$gregDateFromJd=JdToGregorian($gregToJd);
		echo "month: $month, day: $day, year: $year <br>";
		echo "JulianDay from gregorian date: $gregToJd <br>";
		echo "GregorianDate from julian day: $gregDateFromJd <br>";


Expected result:
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One would expect the following output from the code:

month: 3, day: 18, year: 26
JulianDay from gregorian date: 1730633
GregorianDate from julian day: 3/18/26
month: 3, day: 18, year: 22
JulianDay from gregorian date: 1730633
GregorianDate from julian day: 3/18/26
month: 3, day: 18, year: 0026
JulianDay from gregorian date: 1730633
GregorianDate from julian day: 3/18/26 

Actual result:
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The actual output of the code is as follows:

month: 3, day: 18, year: 26
JulianDay from gregorian date: 1730633
GregorianDate from julian day: 3/18/26
month: 3, day: 18, year: 22
JulianDay from gregorian date: 1729172
GregorianDate from julian day: 3/18/22
month: 3, day: 18, year: 0026
JulianDay from gregorian date: 1730633
GregorianDate from julian day: 3/18/26