In the email template, startDate and endDate display the same value.

[MeisterAdebar]

Hi,

the endDate in the email template currently shows the same value as startDate.

<p style="font-family: Arial, Helvetica, sans-serif; font-size: 12pt;">
anbei übersenden wir Ihnen die Rechnung für den Aufenthalt vom 
<strong>[[ position.startDate|date('d.m.Y') ]]</strong> bis 
<strong>[[ position.endDate|date('d.m.Y') ]]</strong>.
</p>

Can you confirm this?

By the way, ‘E-Mail Vorlage für Reservierungen’ should now be changed to ‘E-Mail Vorlagen’, correct?

[MeisterAdebar]

Sorry, I noticed, it needs a loop, like in the example template for the list of room positions.

<p style="font-family: Arial, Helvetica, sans-serif; font-size: 12pt;" data-repeat="apartmentPositions" data-repeat-as="position">
anbei übersenden wir Ihnen die Rechnung für den Aufenthalt vom 
<strong>[[ position.startDate|date('d.m.Y') ]]</strong> bis 
<strong>[[ position.endDate|date('d.m.Y') ]]</strong>.
</p>

[developeregrem]

The new way with data-* for loops or if-conditions is the recommended way but you can still use your old templates and the old way with pure twig syntax. However keep in mind to not switch between code and visual mode when you use more complex logic as the visual mode could break stuff. Only valid html elements are allowed here.

By the way, ‘E-Mail Vorlage für Reservierungen’ should now be changed to ‘E-Mail Vorlagen’, correct?

I would stick to the old name as this indicates that you have access to the reservations inside the template. But the name of the template itself is up to you.