I continually have the need to send out email reminders for soccer games, church meetings, birthdays, etc. I would love to be able to write these emails when I have the time, and schedule them to be sent at a specific date/time. Boomerang for Gmail is the tool I have been waiting and searching for.
Boomerang for Gmail is a Firefox/Chrome plugin that lets you take control of when you send email messages. It works for Gmail accounts and Google Apps email accounts.
Check it out http://www.baydin.com/boomerang4gmail/
Quick example of how to format a date using the Yii Framework