Assume this is in one column and you only need the date?
If you want to keep the time make sure there is an empty column to the
right,
select the column, do data>text to columns, select fixed width and click
next, make sure one line is right after the year and double click the other
lines and click next, if you want to remove what's to the right of the date
select the column to the right and select don not import (skip) then click
finish
If you want to keep what's to the right just click finish in step 2 after
setting the lines
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Regards,
Peo Sjoblom