
Explanation:
Box 1: TOTALYTD
TOTALYTD evaluates the specified expression over the interval which begins on the first day of the year and ends with the last date in the specified date column after applying specified filters.
Syntax: TOTALYTD (
<Expression>,
<Dates>
[, <Filter>]
[, <YearEndDate>]
Expression - The expression to be evaluated.
Dates - The name of a column containing dates or a one column table containing dates.
Example:
TOTALYTD ( -- 2007-01-01 : 2007-05-12
[Sales Amount],
'Date'[Date]
Box 2: 'Date'[Date]
Reference:
https://dax.guide/totalytd/