hange the value up or down effecting others for example 1990-12-31 + 1 day = 1991-01-01. </p>
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<tr><td class="fieldname"><em><a class="anchor" id="a92cf9485b91d60b70ef00e183bdf4e95a704e0e917603c2a88de22f3426a3e20b"></a>roll</em>&#160;</td><td class="fielddoc">
<p>Change the value up or down not effecting others for example 1990-12-31 + 1 day = 1990-12-01. </p>
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