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# Convert Julian date to 12 month calendar date

Posted on 2014-09-15
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I'm using Access to connect to the Pervasive database using ODBC. I have some tables that contain a Julian Calendar date which I need to convert to a regular 12 month calendar date

PERIOD_01 = 2012213 which is August the 1st 2013 and I want in date format.

I'm using this Julian calendar here for reference. http://www.fs.fed.us/fire/partners/fepp/julian-calendar.pdf
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Question by:Gerhardpet
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LVL 120

Expert Comment

ID: 40323972
How to Convert Julian Days to Dates
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LVL 28

Expert Comment

ID: 40323981
Use the PSQL function DateAdd() to subtract the known value (supply the value as a nagative) from the known date. This will give you the starting date for the calendar. From there, use the same function, but supply the starting date and use positive values, and it should calculate it for you. If you are not sure how to use the DateAdd function, start the Pervasive Control Center, then help/docs, then search for DateAdd.
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LVL 49

Expert Comment

ID: 40324035
Here is a one-liner:

j = 2013213
datDate = DateSerial(j \ 1000, 1, j Mod 1000)

=> 2013-08-01

/gustav
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LVL 1

Author Comment

ID: 40324128
I would rather do this in Access since I'm able to do much with my queries that I can when running them in PCC

@Gustav Brock: Can you give me a bit more details? Not sure what to do with what you have posted.
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LVL 49

Expert Comment

ID: 40324138
Don't know what you wish to do, but for example a Query:

Select *, DateSerial([YourDateFieldName] \ 1000, 1, [YourDateFieldName] Mod 1000) As TrueDate
From tblYourTable

/gustav
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LVL 120

Expert Comment

ID: 40324241
@Gerhardpet

did you look at the codes from the link I posted?

.
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LVL 1

Author Comment

ID: 40324450
@gustav.

That worked

How would I add + 1 now? I want the date +1 day?

@ Rey - Yes I did but I mostly rely on Access to do the queries for me so I could not make much out of the link.
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LVL 49

Accepted Solution

Gustav Brock earned 500 total points
ID: 40324842
That's easy. Modify the day parameter of DateSerial:

Select *, DateSerial([YourDateFieldName] \ 1000, 1, [YourDateFieldName] Mod 1000 + 1) As TrueDate
From tblYourTable

/gustav
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LVL 1

Author Closing Comment

ID: 40326729
@gustav

That worked great! Thanks for your help!
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LVL 49

Expert Comment

ID: 40327327
You are welcome!

/gustav
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