Add news for Dates - ISO year / ISO week utilities

NEWS.md

@@ -113,6 +113,10 @@ Standard library changes
 * Introspection utilities such as `@code_typed`, `@which` and `@edit` now accept type annotations as substitutes for values, recognizing forms such as `f(1, ::Float64, 3)` or even `sum(::Vector{T}; init = ::T) where {T<:Real}`. Type-annotated variables as in `f(val::Int; kw::Float64)` are not evaluated if the type annotation provides the necessary information, making this syntax compatible with signatures found in stacktraces ([#57909], [#58222]).
 * Code introspection macros such as `@code_lowered` and `@code_typed` now have a much better support for broadcasting expressions, including broadcasting assignments of the form `x .+= f(y)` ([#58349]).
 
+#### Dates
+
+* `isoweekdate`, `isoyear`, `weeksinyear` are now implemented and exported for week based calendars, following [ISO week date](https://en.wikipedia.org/wiki/ISO_week_date) ([#48507]).
+
 External dependencies
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