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$(document).ready(function() {

$('#issue-form').submit(function(event) {

const customField5Value = $('#issue_custom_field_values_5').val();

const index = customField5Value.indexOf("aaa");

if (index !== -1) {

  const datetimeString = customField5Value.substr(index + 3, 10);
  $('#issue_custom_field_values_4').val(datetimeString);
} 

});
});