Sorting by values in matrix

Hi i am trying to sort dates in a matrix visual using dates as a values, company names(competitior companies - A, B, C etc.) in columns and cities in rows....But i am not able to sort by dates in ascending order.

The desired output is sorting dates in ascdening order with cities irrespective to company names & company order. PFB

I am using matrix visual in Power BI to display this. Could you help me to solve this ?

Thanks in Advance!