Hello,

In church records from Zeeland in the mid-1600s often the day is preceded by the word "Adij" as in "Adij 27 September."

What is the meaning of "Adij" -- is it an abbreviation?

Thank you.

Anno Domini?

adi  · op de dag. Latijn ad diem [ook: adij].

http://resources.huygens.knaw.nl/pdf/vocglossarium/VOCGlossarium.pdf 

Thank you Pauwel. This explanation makes sense.  The reference to the VOC Glossarium could be very useful as well.

You're welcome!