Normal Date to Julian Date
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Write a Visual Basic function named Julian which will compute the number of days which have elapsed since January 1, 4713 BC.
Here is an algorithm to compute the Julian date given the month, day, and year expressed as integers:
If the year is negative, add 1 to it.
If the month is past February, add 1 to the month; otherwise, add 13 to the month and subtract 1 from the year.
Then compute
Dim lngJulDate As Long = Math.Floor(365.25 * intYear) + Math.Floor(30.6001 * intMonth) + intDay + 1720995.0
If the date was before October 15, 1582, return this value.
Otherwise, perform the following correction:
Dim intAdjustment As Integer = (0.01 * intYear)
lngJulDate = lngJulDate + 2 - intAdjustment + 0.25 * intAdjustment
Write a program which uses this function to convert a date into its corresponding Julian date.
A convenient test case is October 9, 1995 which is Julian date 2,450,000.
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Convert Normal Date to Julian Date
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