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If you put the cursor on such a line you can:

• 0 to put the cursor in the first column.
• f to put the cursor in the first blank.
• i Enter Esc to split the line.
• l to move the cursor one line up.
• .!date +\%Y\%m\%d to execute the command.
• J to join the lines again.

From :h :visual_example:

Currently the ":" command works on whole lines only. When you select part of a line, doing something like ":!date" will replace the whole line. If you want only part of the line to be replaced you will have to make a mapping for it. In a future release ":" may work on partial lines.

See also :h visual-operators for details.

From this comment: You can also try the vis or NrrwRgn plugin. Both should handle it just fine. (Thanks @christian-brabandt for the tip).