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echop=%100\<60;echo $[$1%100<60&($1$[$1$p&$1/100)%100<60]100$p]
Try it online!Try it online!
Input is passed as an argument.
Output is 0 (falsey) or 1 (truthy).
(I've deleted an earlier 45-byte version that used egrep.]
echo $[$1%100<60&($1/100)%100<60]
Try it online!
p=%100\<60;echo $[$1$p&$1/100$p]
egrepecho '$[$1%100<60&([01].|2[0-3]$1/100)[0-5].[0-5].$'<<<00000$1%100<60]
Output is in the exit code0 (0 = truthy,falsey) or 1 = falsy, as usual(truthy).
egrep '([01].|2[0-3])[0-5].[0-5].$'<<<00000$1
Output is in the exit code (0 = truthy, 1 = falsy, as usual).
