@atlaskit/datetime-picker/dist/esm/internal/is-valid.js

A date time picker allows the user to select an associated date and time.

export function isValid(timeString) {
  /**
   * Regex match for `12:34`, `12:34:56`, `1:23:56 p`, `1:23:56PM`, and a bit more…
   */
  var time = timeString.trim().match(/([012]?[\d])(?::([0-5][\d]))?(?::([0-5][\d]))?\s*([ap]m?)?/i);

  /**
   * Regex match for `1234`, `12:34`, `12.34`, `123456`, `12:34:56`, `12.34.56`
   */
  var time24hr = timeString.trim().match(/([012][\d])[:.]?([0-5][\d])([:.]?([0-5][\d]))?/);

  /**
   * Convert `2:34:56 pm` down to `23456`
   */
  var num = timeString.replace(/[^0-9]/g, '');
  var includesSeconds = time && time[1] !== undefined && time[2] !== undefined && time[3] !== undefined || time24hr && time24hr[1] !== undefined && time24hr[2] !== undefined && time24hr[4] !== undefined;
  if (!time && !time24hr) {
    return false;
  }
  if (time && !time[1]) {
    return false;
  }
  if (num.length > 6) {
    return false;
  }
  if (num.length > 4 && !includesSeconds) {
    return false;
  }
  if (num.length === 2 && parseInt(num, 10) > 12) {
    return false;
  }
  return true;
}