| The following are examples of custom date or time formats that are not valid ISO or W3C format
                    normalizations, normalized to a different dating system <p>Alhazen died in Cairo on the<date when="1040-03-06" when-custom="431-06-12"> 12th day of Jumada t-Tania, 430 AH
 </date>.</p>
 <p>The current world will end
 <date when="2012-12-21" when-custom="13.0.0.0.0">at the end of B'ak'tun 13</date>.</p>
 <p>The Battle of Meggidu
 (<date when-custom="Thutmose_III:23">23rd year of the reign of Thutmose III</date>).</p>
 <p>Esidorus bix(i)t in p(ac)e annos
 LXX pl(u)s m(inu)s s(ub) <date when-custom="Ind:4-10-11">d(ie)
 XI men(sis) O(cto)b(ris) ind(ictione) IIII</date>
 </p>
 Not all custom date formulations will have Gregorian equivalents. The when-custom attribute and other custom dating are not contrained to a datatype by the TEI, but
        individual projects are recommended to regularize and document their dating formats. |