+ <returns>
+ <attribution license="cc4" from="Microsoft" modified="false" />
+ <para>A positive integer from 1 through 13 that indicates the leap month in the specified year and era.</para>
+ <para> -or-</para>
+ <para>Zero if this calendar does not support a leap month, or if the <paramref name="year" /> and <paramref name="era" /> parameters do not specify a leap year.</para>
+ </returns>