Sets the date pointed to by value corresponding to the date of the given field.
Caller is responsible for making sure the field exists and has the correct type.
On success value will point to a newly-allocated copy of the date which should be freed with g_date_free when
no longer needed (note: this is inconsistent with e.g. get_string which doesn't
return a copy of the string).
| this | |
| fieldname |
the name of a field |
| value |
a pointer to a Date to set |
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