I'm getting january with this formula. Any change that I do in it causes january return.
ex
{QUOTE "{=MOD({DATE \@ M},12)+1}/1/00" \@ "MMMM"}
{QUOTE "{=MOD({DATE \@ M},12)+2}/1/00" \@ "MMMM"}
{QUOTE "{=MOD({DATE \@ M},12)+2}/2/00" \@ "MMMM"}
all above will give january