In the last few days Gmail (I run it in English [UK]) changed the default reply-attribution string from:

On 10/04/2009, Firstname Lastname <firstname.lastnamegmail.com> wrote:

to

2009/04/16, Firstname Lastname <firstname.lastnamegmail.com>:

apparently in order to universalize its prompts. The string is detected by Gmail as the delimiter beneath which included replied-to content may be suppressed at run time. Too bad they still cling to the American convention of serving numerical date tokens delimited by slashes, rather than by ISO-standard dashes (i.e. "2009/04/16" ought to be "2009-04-16" [which, for the anally-retentive among us, amounts to "1989"]).

Three small dashes for Google, one giant leap closer to the Semantic Web.