Gets the date that is at the given index for the given tag in the given list and copies it into the variable pointed to by value
.
Free the date with g_date_free when it is no longer needed.
Free-function: g_date_free
| this |
a TagList to get the tag from |
| tag |
tag to read out |
| index |
number of entry to read out |
| value |
location for the result |
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