Conversion of Julian date to YYYYMMDD

Question

Hi,
The flat file has the date in Julian date format YYYYDDD. How to load it into infoprovider in the format YYYYMMDD?
Thanks.

Answer 1

To get the YYYY portion of the Gregorian Date, you would use the YYYY portion of the Julian Date.
To get he MMDD portion of the Gregorian Date you would start with the DDD portion of the Julian Date and start subtracting 31, 28 (or 29 in leap years), 31, 30, 31, 30, 31, 31, 30, 31, 30, and 31, successively, until you first get a result which is zero or negative. The month MM is the number of subtractions you have done, and the last positive subtraction result is the day DD.
As an example, let's use a Julian Date of 2009.278. The YYYY of the Julian Date (2009) would be the YYYY for the Gregorian Date. To get MMDD, start subtracting from 278 as follows:
278 - 31 = 247
247 - 28 (2009 not being a leap year) = 219
219 - 31 = 188
188 - 30 = 158
158 - 31 = 127
127 - 30 = 97
97 - 31 = 66
66 - 31 = 35
35 - 30 = 5
5 - 31 = -26
Since the tenth calculation was the last result that was positive, the MM is 10 and since the positive value from that is the DD or 5. This would result in a Gregorian Date of 20091005.