diary-unknown-timediary-unknown-time is a variable defined in `
diary-lib.el'. Its value is
-9999Documentation: Value returned by `diary-entry-time' when no time is found. The default value -9999 causes entries with no recognizable time to be placed before those with times; 9999 would place entries with no recognizable time after those with times. You can customize this variable. This variable was introduced, or its default value was changed, in version 20.3 of Emacs.