AudioSource.time

Description

Audio source playback position in seconds.

Use this to read current playback time or to seek to a new playback time.

Be aware that: On a compressed audio track position does not necessarily reflect the actual time in the track
Compressed audio is represented as a set of so-called packets.
The length of a packet depends on the compression settings and can quite often be 2-3 seconds per packet.

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour
{
    AudioSource audioSource;

    void Start()
    {
        audioSource = GetComponent<AudioSource>();
    }

    void Update()
    {
        if (Input.GetKeyDown(KeyCode.Return))
        {
            audioSource.Stop();
            audioSource.Play();
        }
        Debug.Log(audioSource.time);
    }
}