export function zeroFill(num: number, targetLength: number, forceSign?: boolean): string {
  const absNumber = `${Math.abs(num)}`;
  const zerosToFill = targetLength - absNumber.length;
  const sign = num >= 0;
  return (sign ? (forceSign ? '+' : '') : '-') +
    Math.pow(10, Math.max(0, zerosToFill)).toString().substr(1) + absNumber;
}

export function mod(n: number, x: number): number {
  return ((n % x) + x) % x;
}

export function absFloor(number: number): number {
  return number < 0
    ? Math.ceil(number) || 0
    : Math.floor(number);
}

export function createUTCDate (y?: number, m?: number, d?: number, h?: number, M?: number, s?: number, ms?: number) {
  const date = new Date(Date.UTC.apply(null, arguments));

  // the Date.UTC function remaps years 0-99 to 1900-1999
  if (y < 100 && y >= 0 && isFinite(date.getUTCFullYear())) {
    date.setUTCFullYear(y);
  }
  return date;
}