Change to ISO 8601 date formats, without time of day.
(change-log-font-lock-keywords): Adjust accordingly. (add-change-log-entry): Compare and insert with new date format. (change-log-mode): Make `paragraph-start' and `paragraph-separate' use \< like `page-delimiter' for consistency. (change-log-time-zone-rule): New variable. (iso8601-time-zone): New function. (add-change-log-entry): If change-log-time-zone-rule is non-nil, calculate date according to that rule, and indicate resulting time zone.
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