You can define, which date you wish to be used on the invoice in Visma e-accounting.

This can be selected in the settings for your Visma e-conomic module in IEX.
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Go to Invoice settings and find the field Invoice date. Here you can choose between "Order date" and "Transfer date".

With "Order date" selected the date on the invoice will be set with the date the order was created in the webshop.
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With "Transfer date" selected, the date on the invoice will be set with the date the order was transferred to Visma e-conomic.