#作成動機
なんとなくやってみたかった
#コード
Code.gs
function createEvents(mail) {
  var calendar = CalendarApp.getDefaultCalendar();
  var title = mail['subject'];
  var startTime = new Date(mail['date']);
  var endTime = new Date(mail['date']);
  var location = '';
  
  if(mail['duedate']) {
    endTime = new Date(mail['duedate']);
  }
  
  if(mail['location']) {
    location = mail['location'];
  }
  
  var option = {
    description: mail['body'],
    location: location
  }
  
  console.log("add event detail")
  console.log("title = " + title)
  console.log("start = " + startTime)
  console.log("end = " + endTime)
  console.log("body = " + mail['body'])
  console.log("location = " + location)
  
  //return calendar.createEvent(title, startTime, endTime, option);
  calendar.createEvent(title, startTime, endTime);
}

function extractDueDate(target,pattern) {

  var regexp = new RegExp(pattern,'i')
  var match_result = target.match(regexp);

  if( match_result.length > 0 ) {
    return match_result
  } else {
    return "" 
  }
  
}

function fetchContactMail(filterPattern) {
 var now_time= Math.floor(new Date().getTime() / 1000) ;
 var time_term = now_time - ((60 * get_interval) + 3);
 
 var strTerms = '(is:unread after:'+ time_term + ')';
 
 var myThreads = GmailApp.search(strTerms);
 var myMsgs = GmailApp.getMessagesForThreads(myThreads);
 var valMsgs = [];

 for(var i = 0; i < myMsgs.length;i++){
   
   var contents = myMsgs[i][0].getFrom() + myMsgs[i][0].getSubject() + myMsgs[i][0].getPlainBody()
   
   regexp = new RegExp(filterPattern,'i')
     
   if(! contents.match(regexp) )
   {
     continue
   }
  
   var mailcontents = {
     "date": myMsgs[i][0].getDate()
     , "from" : myMsgs[i].slice(-1)[0].getFrom()
     , "subject" : myMsgs[i].slice(-1)[0].getSubject()
     , "body" : myMsgs[i].slice(-1)[0].getPlainBody()
   }
   valMsgs[i] = mailcontents
 }
 
 return valMsgs;
}

function main() {
 newmail = fetchContactMail("旧作全品55円")
 if(newmail.length > 0){
   for(var i = newmail.length-1; i >= 0; i--){
     //send_line(newmail[i])
     var dueDates = extractDueDate(newmail[i]['body'],"【期間限定】(.*?)年(.*?)月(.*?)日.*?\\)(.*?)まで")
     
     console.log(dueDates[1])
     console.log(dueDates[2])
     console.log(dueDates[3])
     console.log(dueDates[4])
     
     newmail[i]['duedate'] = new Date(dueDates[1] + "/" + dueDates[2] + "/" + dueDates[3] + " " + dueDates[4])
     
     createEvents(newmail[i])
   }
 }
}