coding language question

[simoncn]

The standard tag for date is named Date. It can hold a year (yyyy) or a more complete date (yyyy-mm or yyyy-mm-dd). Some tagging programs dsplay this Date tag as Year in an attempt to "simplify" things for the user.

The symbols $ ^ } were chosen to have special meanings because they are unlikely to conflict with symbols that appear in other elements of a tag format string (tag name, prefix, suffix and separator).