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How to test a valid date string, assuming acceptable format is “YYYY-MM-DD”? (Y year, M month, D day)
I’ve tried DateFormat.parse(date_string) but it parses things like “2012-542-86”.
As default, the parsing is lenient, which means it uses heuristics to parse non-exact matches.
You need to turn this off using #setLenient(false) to make it reject all non-matching formats.