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What's the reason it failed at 32bit system?

why
date -d "19010101" gets error " date: invalid date `19010101' "

but
date -d "19020101" is fine?

Any approach to fix that?
Thank you.

Assuming the "ABC20090102" string is fixed length.
And I'm using sh shell.

ls -1 *.txt | awk '{print "mv", $1, substr($1,12) }' | sh