myLife.js

var SLACK_WEBHOOK_URL = 'https://hooks.slack.com/services/***';
var SLACK_CHANNEL = '@yyoshiki41';
var SLACK_USERNAME = 'My Life';
var SLACK_EMOJI = ':books:';

function myFunction() {
  var birthYear = '1990';
  var birthDate = '7/5';
  
  var now = Moment.moment();
  var endOfWeek = Moment.moment().endOf('week');
  if (now.day() == 0) {
      // when Sunday
      endOfWeek = endOfWeek.add(-6,'days');
  }
  var endOfMonth = Moment.moment().add(1, 'months').date(0);

  var dob = birthYear + '/' + birthDate;  
  var nextBirthday = Moment.moment(now.get('year') + '/' + birthDate);
  if (now.diff(nextBirthday, 'days') >= 0) {
      nextBirthday = nextBirthday.add('years', 1);
  }
  var targetAge = 30;
  var targetAgeBirthday = Moment.moment(dob).add('years', targetAge);

  var message = '';
  message += '今週残り *' + -now.diff(endOfWeek, 'hours') + '時間* \n';
  message += '今月残り *' + -now.diff(endOfMonth, 'days') + '日* ';
  message += '( *' + -now.diff(endOfMonth, 'hours') + '時間* )\n';
  message += nextBirthday.diff(dob, 'years') + '歳まであと *' + -now.diff(nextBirthday, 'days') + '日* ';
  message += '( *' + -now.diff(nextBirthday, 'hours') + '時間* )\n';
  message += targetAge + '歳まであと *' + -now.diff(targetAgeBirthday, 'days') + '日* ';
  message += '( *' + -now.diff(targetAgeBirthday, 'hours') + '時間* )\n';

  sendToSlack(message);
}

function sendToSlack(message) {
  var jsonData =
  {
     "channel" : SLACK_CHANNEL,
     "username" : SLACK_USERNAME,
     "icon_emoji": SLACK_EMOJI,
     "text" : message
  };
  var payload = JSON.stringify(jsonData);
  
  var options =
  {
    "method" : "post",
    "contentType" : "application/json",
    "payload" : payload
  };
  UrlFetchApp.fetch(SLACK_WEBHOOK_URL, options);
}