There should be option for default Date/Month in Power BI.

[Siddhesh_Pal]

When opening the Power BI report, it should have a default Date/Month filter, where we can see the visual based on the current Date/Month filter after that we can select a slicer as per our requirement.

If these features are available then it will be very helpful.
Any way we can achieve this is by writing a calculated column and measures, but if there is any direct option in slicer then it will be very easy.

[MohamedFowzan1]

Try using the custom visual "Date Picker" for having a default value without a measure but I believe the full version for this is paid.