The DATETIME type doesn't save a string. It stores it internally as a numeric type, which it autocasts for you. If you want to save it with a particular formatting, you need to use a different type. If I recall, DATETIME fields are a fixed 8-bytes, at least in mySQL5, you are trying to save something much longer.

In reply to Re^3: datetime insertion problem by fishbot_v2
in thread datetime insertion problem by Nik

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