if i am going to upgrade ojs2.4.8 to ojs3.2.1-4 then error showing. please help 
Errors occurred during installation:
*** A database error has occurred: Incorrect datetime value: ‘0000-00-00 00:00:00’ for column ‘date_due’ at row 1560**
Hi @shantanusingh,
You may want to try what is suggested here: Upgrade failure (2.4->3.1) - #7 by pjohanneson (please note the points about having a good backup).
-Roger
PKP Team
thank you for reply, now its working and up gradation under progress but its taking too much time. after 7h no error and updation under process. if any problem then we will reach you.
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