[時「とき」] => At the time A N5
Time
を[問「と」]わず => Disregarding A; Without relation to A N2
Considering, Concerning
Vた[時「とき」] => After having done something N5
Time
[事「こと」]だ => A is necessary/good (offering advice/suggestion) N3
Needs, Requirement
[事「こと」]ができる => Be able to A; can do A, Can A; be possible to A; N4
Causative, Passive, Volitional
に[限「かぎ」]った[事「こと」]ではない => It's not limited to A, it's not only A N1
Degree/ Level/Amount