negative [h]:mm:ss does not show on the x axis of a chart
 

If you have minus hh:mm:ss time on a chart or pivot chart the x axis does not
display any values down it's axis. and when you hove over the bar, value is
empty.

In Excell 2003 it work fine in a normal chart, but not pivot chart. In Excel
2007 neither work.

Also when you select the 1904 date system, the times fly through the roof.
time is displayed as 1:00:00 on the worksheet, but within the pivottable /
chart they are shown as 35089:00:00, formula in the cell = 3600 / 86400.
fields / cells all are formatted as [h]:mm:ss

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