Inserting static date when value is zero

[DECROMAX]

Hi I need some guidance . I am trying to automatically insert (current) static dates in the cells in column p&q when the cells in columns m&n reach the value of zero. Any help would be appreciated . xls below sheet 2

[protonLeah]

Right clock the sheet tab, select: View Code then paste this sheet change macro in:

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[DECROMAX]

Thanks for that I just need you to modify it so instead of using column K for the values I use columns M&N and insert the dates into P&Q.
Thanks