Set a Default Datetime

[Cabaret_]

Hello!
I'm trying to set a default Hour after the task is creating by using a custom Formula but it's not changing anything.
Can someone help me?

[rabii]

of course it is not working because the function is not assigned to anything, try this instead:

$horas = 19;
$minutos = 00;

dateEnd = datetime\addHours(createdAt, $horas);
dateEnd = datetime\addMinutes(createdAt, $minutos);​

this code will set the dateEnd (due date) to createdAt + 19h

Hope this helps.
Thanks