The present invention relates to a ten thousand-year calendar capable of easily changing a day of the week. The ten thousand-year calendar comprises: a date panel composed of seven pieces of information for each different week on front and rear surfaces to be formed for each day of the week; a month display panel for displaying month information from January to December; a calendar frame having the month display panel provided in an upper part, having the date panel arranged for each day of the week in a lower part of the month display panel, and having a magnet for providing a predetermined magnetic force to detachably couple the month display panel and the date panel; a calendar fixing panel supporting a rear part of the calendar frame while a lower part of the calendar frame is mounted thereon; and a clock coupled to one side of the calendar frame to display time information.
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