I think there is a bug in the PostgreSQL date system:
Try computing (replace XXXX with some differents years):
'XXXX-10-01'::datetime + '1 month'::interval
Depending on the year, you can get 'XXXX-11-01' as expected or 'XXXX-10-31'
which is bug.
Guillaume Perréal - Stagiaire MIAG
Cemagref (URH), Lyon, France
Tél: (+33) 18.104.22.168.64
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