function rearrangeDate(dateString) {
var numbers = dateString.substring(0,4);
return dateString.substring(5) + '-' + numbers
}
rearrangeDate('2017-01-02');
function rearrangeDate(dateString) {
var numbers = dateString.substring(0,4);
return dateString.substring(5) + '-' + numbers
}
rearrangeDate('2017-01-02');
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