Date sorting in two columns

Hello,

I'm struggling to find a solution in excel and hoping you can help, i'm new to the forum so please let me know if 've posted in the wrong area.

I sort vehicle/Trailer service/ Mots for a few of our teams meaning i have about 90 separate items. I get a monthly list containing Vehicle info with two columns of dates of when each vehicle/Trailer service and Mot is due.

what i would like to be able to do is sort it so that the spread sheet will put the soonest dates out of the two columns at the top, so i can see which vehicles/trailers need to be booked in, so far I have have only managed to do one column at a time using the sort feature and it would make my life alot easier if I could do both.

Unfortunately I cant put pictures up of the actual sheet as it obviously has sensitive data such as registrations and addresses.

Any help would be appreciated, Thankyou