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-2 bytes each thanks to @kanine and @l4m2
a=>a.padStart(6,0).match(/\d\d../g).every(x=>x<60)
Try it online!Try it online!
a=>a.padStart(6,0).match(/\d\d/g).every(x=>x<60)
Try it online!
a=>a.padStart(6,0).match(/../g).every(x=>x<60)
a=>a.padStart(6,'0'0).match(/\d\d/g).every(x=>x<60)
a=>a.padStart(6,'0').match(/\d\d/g).every(x=>x<60)
a=>a.match(/\d\d/g).every(x=>x<60)
