Dated gear is gear that was made from old recipes before the recipe revamp from 1.19 (pre sure).. and those recipes will be phased out.. so eventually you will not see "Dated" equip.

You will need to re-equip your self, Google Mooglebox and check out what gear you could upgrade to and go from there, you can always shout in town requesting a crafter to do a few synths for you, most will not oblige as every synth counts towards something..