Add dependences to your project

The logic

Integration Studio:

Code:

using System;
using System.Collections;
using System.Data;
using OutSystems.HubEdition.RuntimePlatform;
using OutSystems.RuntimePublic.Db;

namespace OutSystems.NssUnixTimestamp {

public class CssUnixTimestamp: IssUnixTimestamp {

/// <summary>
///  This exension converts unix timestamp of current moment in milliseconds
/// </summary>
/// <param name="ssResult"></param>
public void MssReturnUnixTimestamp(out string ssResult) {
            var Timestamp = (long)(DateTime.UtcNow - new DateTime(1970, 1, 1)).TotalMilliseconds;
                ssResult = Timestamp.ToString();
} // MssReturnUnixTimestamp


} // CssUnixTimestamp

} // OutSystems.NssUnixTimestamp