A google apps script that reminds me that I have a package delivery. It schedules an SMS for the time I arrive home (about 6:30pm) on any day when I receive an email with a certain label.

gistfile1.js

/**
 * Author: alex.flint@gmail.com
 * Date: December 16, 2012
 * 
 * A google apps script that reminds me that I have a package delivery. It 
 * schedules an SMS for the time I arrive home (about 6:30pm) on any day when
 * I receive an email with a certain label.
 */
 
////////////////////////////////////////////////////////////////////////////////
// VARIABLES TO CONFIGURE
////////////////////////////////////////////////////////////////////////////////
 
// Time at which to send reminder. Default is 6:30pm.
var kReminderTimeHour = 18;
var kReminderTimeMin = 30;
 
// This script will look for emails with this label. If it finds one it will 
// schedule a reminder and then remove the label (to avoid multiple reminders)
var kGmailLabel = 'Reminder Pending'
 
// The script will insert reminders into the calendar with the following name. 
// Create a calendar with this name and then hide it in order to avoid cluttering
// your calendar. (To create a calendar, log into Google Calendar and click the
// down arrow next to "Calendars" on the left side of the screen.
var kCalendarName = 'Automated';
 
 
////////////////////////////////////////////////////////////////////////////////
// IMPLEMENTATION
////////////////////////////////////////////////////////////////////////////////
 
String.prototype.format = function() {
  var args = arguments;
  return this.replace(/{(\d+)}/g, function(match, number) { 
    return typeof args[number] != 'undefined'
      ? args[number]
      : match
    ;
  });
};
 
 
function sendText() {
  
  var label = GmailApp.getUserLabelByName(kGmailLabel);
  var threads = label.getThreads();
  
  Logger.log('There are '+threads.length+' threads with label "'+label.getName()+'"')
 
  if (threads.length > 0) {
    // Construct a date at XX:YY today (if before XX:YY) or XX:YYpm tomorrow (if after XX:YY)
    var t = new Date();  // initialized to now
    
    Logger.log("Current time is {0}:{1} on {2}/{3}/{4}".format(t.getHours(),
                                                               t.getMinutes(),
                                                               t.getDate(),
                                                               t.getMonth(),
                                                               t.getYear()));
 
    min = t.getMinutes();
    hr = t.getHours();
    
    // Add a margin of 2 minutes
    var waitUntilTomorrow = false;
    if (hr > kReminderTimeHour || (hr == kReminderTimeHour && min > kReminderTimeMin-2)) {
      waitUntilTomorrow = true;
      Logger.log('Wait until tomorrow!');
    }
    
    // Set the reminder time
    t.setHours(kReminderTimeHour);
    t.setMinutes(kReminderTimeMin);
    if (waitUntilTomorrow) {
      // Add one full day
      // This is better than setDate because it will wrap at the end of months and/or years
      t.setTime(t.getTime() + 1000*60*60*24);
    }
    
    // Log the reminder time.
    Logger.log("Will remind at {0}:{1} on {2}/{3}/{4}".format(t.getHours(),
                                                              t.getMinutes(),
                                                              t.getDate(),
                                                              t.getMonth(),
                                                              t.getYear()));
    
    // Get the email address of the active user - that's you
    var emailAddress = Session.getActiveUser().getEmail();
 
    calendars = CalendarApp.getCalendarsByName(kCalendarName)
    if (calendars.length != 1) {
      Logger.log("There were %d calendars named 'Automated'");
    } else {
      Logger.log('Found the calendar: '+calendars[0].getName())
      
      // Create the event
      event = calendars[0].createEvent('You have a package delivery', t, t);
      event.removeAllReminders();
      event.addSmsReminder(0);
  
      // Remove the label so that we do not send multiple messages
      label.removeFromThreads(threads);
    }
  }
}