Duplicate emails sent from Apps Script project that has a weekly time-based trigger

Question

The below script was correctly sending one weekly email to each person who met the conditions specified in the script. The trigger is time-based, set to run weekly on Monday

Answer 1

This seems to be a bug

Untl it's fixed, as a workaround:

• Use Script Properties to save the last execution time
• Implement an if statement at the beginning of your code that executes the rest of the code only if the last execution time (retrieved from the script properties) is not less than one week ago

Sample:

function sendEmailLoop() {
  if(!PropertiesService.getScriptProperties().getProperty("lastExecution")){
    PropertiesService.getScriptProperties().setProperty("lastExecution", new Date().getTime());
  }
  var lastExecution = PropertiesService.getScriptProperties().getProperty("lastExecution");
  var now = new Date().getTime();
  var oneWeek = 1000*3600*24*7;
  if(now-lastExecution >= oneWeek){
    // paste here the rest of your code
    PropertiesService.getScriptProperties().setProperty("lastExecution", now);
  }
}