http://blog.shotarok.com/post/2016-12-09-auto_creation_of_eikaiwa_events/ の LAVA Yoga バージョン

LavaYoga.js

function LavaYoga() {
  var criteria = "from:reserve@yoga-lava.com 予約完了";
  eachUnreadMessage(criteria, function (message) {
    var subject = message.getSubject();
    Logger.log(subject);
    var [matched, place] = /【LAVA】([^\n]+店)予約完了/.exec(subject);
    var body = message.getBody();
    Logger.log(body);
    var [matched, month, day, sh, sm, eh, em, kind] = /(\d*)月(\d*)日\([月火水木金土日]\) (\d\d):(\d\d)～(\d\d):(\d\d)[^\n]*\n([^\n]+)/.exec(body);
    Logger.log(matched);
    var year = estimateYear(month, day, sh, sm)
    Logger.log(year)
    createEvent("LAVA Yoga [" + kind + "］@" + place,
                new Date(year, month-1, day, sh, sm),
                new Date(year, month-1, day, eh, em));
    }
  );
}

function estimateYear(month, day, sh, sm) {
 var current = new Date;
 var thisYear = new Date(current.getFullYear(), month-1, day, sh, sm);
 var nextYear = new Date(current.getFullYear()+1, month-1, day, sh, sm);
 var d = (current <= thisYear) ? thisYear : nextYear;
 return d.getFullYear()
}