After an invoice sync and you notice the issue and due date of an invoice are set to a date which is one day less than what it was set with, this usually is caused by a mismatch on the timezone settings.
Checking the Timezone Setting in Re-Leased
In RL, you can find it at the bottom of each page, see example below:
If you need to change the setting in RL, please let the Support Team know so that this can be changed in the back end.
Checking and updating the Timezone Setting in Xero
In Xero, you can find it thru the Accounting > Advanced > Financial Settings: