Property:Has adoption date
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Set by Template:Infobox Legal Instrument on pages in Category:Legal instruments. The date the instrument was adopted: for a treaty, the date its text was adopted or opened for signature; for a statute, the date it was enacted or received assent.
The value comes from the infobox's adopted_date parameter, which takes an ISO date (1961-03-30), a year and month (1985-09) or a year (1985). The displayed adopted text is never stored, so a date written in words cannot be misread.