# toTimeUnit method

String toTimeUnit()

Formats the integer as a two-digit time unit for playback duration (MM or SS).

Ensures that single-digit values are zero-padded (e.g., `5` → `"05"`, `12` → `"12"`).

Returns a string representation of the integer in a two-digit format.

## Implementation

    String toTimeUnit() {
      String numberStr = toString();
      return this < 10 ? '0$numberStr' : numberStr;
    }