yichael_smartbow/Assets/JC/JCUtil.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using System;

public class JCUtil : MonoBehaviour
{
    // Start is called before the first frame update
    public static long GetTimestamp()
    {
        TimeSpan ts = DateTime.Now.ToUniversalTime() - new DateTime(1970, 1, 1);
        return (long)ts.TotalMilliseconds;
    }
}