CONVERSION DATE, dependent upon usage, there are likely many definitions varying within the industries in which the term is being used. Basically, it is a date on which an asset is converted into a similarly valued but different asset.
EX-DIVIDEND DATE is the first date a stock trades without dividend, usually four business days before the record date.
MATURITY DATE of a financial asset is the date at which that asset is converted into a specified amount of money or physical assets, e.g. the date on which an issuer of a bond promises to repay the full amount borrowed.
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