How to use the @hathor/wallet-lib.dateFormatter function in @hathor/wallet-lib

// Doing the check here because need to validate before doing parseInt
        const tokensValue = valueStr*(10**hathorLib.constants.DECIMAL_PLACES);
        if (tokensValue > hathorLib.constants.MAX_OUTPUT_VALUE) {
          this.props.updateState({ errorMessage: `Token: ${this.state.selected.symbol}. Output: ${output.current.props.index}. Maximum output value is ${hathorLib.helpers.prettyValue(hathorLib.constants.MAX_OUTPUT_VALUE)}` });
          return null;
        }
        let dataOutput = {'address': address, 'value': parseInt(tokensValue, 10), 'tokenData': hathorLib.tokens.getTokenIndex(this.state.selectedTokens, this.state.selected.uid)};

        const hasTimelock = output.current.timelockCheckbox.current.checked;
        if (hasTimelock) {
          const timelock = output.current.timelock.current.value;
          if (!timelock) {
            this.props.updateState({ errorMessage: `Token: ${this.state.selected.symbol}. Output: ${output.current.props.index}. You need to fill a complete date and time` });
            return null;
          }
          const timestamp = hathorLib.dateFormatter.dateToTimestamp(new Date(timelock));
          dataOutput['timelock'] = timestamp;
        }

        data['outputs'].push(dataOutput);
      }
    }

    const noInputs = this.noInputs.current.checked;
    if (!noInputs) {
      for (const input of this.inputs) {
        const txId = input.current.txId.current.value;
        const index = input.current.index.current.value;

        if (txId && index) {
          data['inputs'].push({'tx_id': txId, 'index': index, 'token': this.state.selected.uid });
        }