Returns a set of sibling members from the same level as a given member, starting with the first sibling and ending with the given member, as constrained by the Year level in the Time dimension.
If a member expression is not specified, the default is the current member of the first hierarchy with a level of type Months in the first dimension of type Time in the measure group.
The Mtd function is a shortcut function for the PeriodsToDate function when the Type property of the attribute hierarchy on which a level is based is set to Months. That is, Mtd(Member_Expression) is equivalent to PeriodsToDate(Month_Level_Expression,Member_Expression).
The following example returns the sum of the month to date freight costs for Internet sales for the month of July, 2002 through the 20th day of July.
WITH MEMBER Measures.x AS SUM ( MTD([Date].[Calendar].[Date].[July 20, 2002]) , [Measures].[Internet Freight Cost] ) SELECT Measures.x ON 0 FROM [Adventure Works]