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For an abelian group $G$ and an integer $t > 0$, the \emph{modifiedErd\"os--Ginzburg--Ziv constant} $s_t'(G)$ is the smallest integer $\ell$ suchthat any zero-sum sequence of length at least $\ell$ with elements in $G$contains a zero-sum subsequence (not necessarily consecutive) of length $t$. Wecompute $s_t'(G)$ for $G = \mathbb Z/n\mathbb Z$ and for $t = n$, $G = (\mathbbZ/n\mathbb Z)^2$.

Modified Erd\"os--Ginzburg--Ziv Constants for $\mathbb Z/n\mathbb Z$ and $(\mathbb Z/n\mathbb Z)^2$