Leveraging the Internet for fun and profit . The same could be said for someone with two computers. Sadly, most networked computer systems do not agree about the current time.
Many people care about what time it is enough to wear a wristwatch.
For typical network applications synchronization is not an issue. The time on web or FTP or mail clients and servers can vary widely. For example, at worst a misdated email message might jump forward or back in their incoming mailbox. The need for time synchronization is a factor among systems that share write access to time-stamped data, such as shared documens. There are many network applications for which consistent timing across systems is critical to application integrity.