Send out a survey invite every other Thursday to a participant list

Hi,

There is no way to set that up only with the native scheduling options. I think someone had a similar request for cron expressions a while ago but I can’t find it.

The way to go around this is to have a workflow firing every day (or every Thursday in your case), a code task to check if the day is a valid distribution day and a workflow condition set up to stop or continue based on the code task result.

For your use case, it would look like this:

Not extensively tested, but your code task should be something like this:

function codeTask() {
  const startingThursday = '2026-01-01'; // Change to your actual starting Thursday

  function isDistributionThursday(startDate) {
    const today = new Date();

    if (today.getDay() !== 4) return false;

    const start = new Date(startDate);
    start.setHours(0, 0, 0, 0);
    const now = new Date(today);
    now.setHours(0, 0, 0, 0);

    const diffInMs = now - start;
    const diffInDays = Math.round(diffInMs / (1000 * 60 * 60 * 24));

    return diffInDays >= 0 && diffInDays % 14 === 0;
  }

  return {
    result: isDistributionThursday(startingThursday)
  };
}