Gmail Custom Time

Guide Note:

For April Fools' Day, Gmail launched a fake custom time option that would allow users to send emails today, with yesterday's date, or even dating back to 2004. But there is a limit to how many emails you can send with the custom time option. Users will only be allowed to send out 10 of these emails because "more than 10 times a year would cause people’s basic belief in 'time' and 'cause and effect' to disintigrate"

This prank is one of the many pranks that were pulled by Google in 2008. Another known prank was Virgle, a joint prank done by Google co-founders Sergey Brin and Larry Page and the Virgin Group's Sir Richard Branson. The purpose of this project is to establish the first permanent human colony on the planet Mars within the next 20 years."