https://github.com/polarnik/gatling-asynclog-plugin/blob/feature/minimalMavenProject/example/src/test/scala/qaload/BasicSimulation.scala

BasicSimulation.scala

package qaload


import java.text.SimpleDateFormat
import java.util.Calendar

import io.gatling.core.Predef._
import io.gatling.http.Predef._

import scala.concurrent.duration._
import qaload.gatling.asynclogplugin.Predef._


class BasicSimulation extends Simulation {

  val httpProtocol = http
    .baseUrl("http://computer-database.gatling.io") // Here is the root for all relative URLs
    .acceptHeader("text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8") // Here are the common headers
    .acceptEncodingHeader("gzip, deflate")
    .acceptLanguageHeader("en-US,en;q=0.5")
    .userAgentHeader("Mozilla/5.0 (Macintosh; Intel Mac OS X 10.8; rv:16.0) Gecko/20100101 Firefox/16.0")

  val scn = scenario("Scenario Name") // A scenario is a chain of requests and pauses
    .exec {
      session =>
        val now = System.currentTimeMillis;
        val nowDate = Calendar.getInstance().getTime()
        val dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.SSS zzz")
        val nowString = dateFormat.format(nowDate)
      session
          .set("start", now)
          .set("startDate", nowDate)
          .set("startDateString", nowString)
    }
    .exec(
      http("/ (GET)").get("/")
    )
    .exec {
      session =>
        val now = System.currentTimeMillis;
        val nowDate = Calendar.getInstance().getTime()
        val dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.SSS zzz")
        val nowString = dateFormat.format(nowDate)
        session
          .set("stop", now)
          .set("stopDate", nowDate)
          .set("stopDateString", nowString)
    }
    .exec {
      session =>
        session
    }
    .exec(asynclog
      .requestName("Generate req 1")
      .startTimestamp("${start}")
      .endTimestamp("${stop}")
      .status(io.gatling.commons.stats.OK)
      .responseCode("200")
      .message("startTimestamp(System.currentTimeMillis), endTimestamp(System.currentTimeMillis)")
    )
    .exec(asynclog
      .requestName("Generate req 2")
      .startTimestamp("${start}")
      .endTimestamp("${stop}")
      .status(io.gatling.commons.stats.KO)
      .responseCode("500")
      .message("500 Error Message")
    )
    .exec(asynclog
      .requestName("Generate req 3")
      .startDate("${startDate}")
      .endDate("${stopDate}")
      .status(io.gatling.commons.stats.OK)
      .responseCode("200")
      .message("startDate(java.util.Date), endDate(java.util.Date) [${startDate}, ${stopDate}]")
    )
    .exec(asynclog
      .requestName("Generate req 4")
      .startTimestamp("${startDateString}", "yyyy-MM-dd HH:mm:ss.SSS zzz")
      .endTimestamp("${stopDateString}", "yyyy-MM-dd HH:mm:ss.SSS zzz")
      .status(io.gatling.commons.stats.OK)
      .responseCode("200")
      .message("startTimestamp(String, Format), endTimestamp(String, Format) [${startDateString}, ${stopDateString}]")
    )
    .exec(asynclog
      .requestName("Generate req 5")
      .startTimestamp("${start}")
      .endTimestamp("${stopDateString}", "yyyy-MM-dd HH:mm:ss.SSS zzz")
      .status(io.gatling.commons.stats.OK)
      .responseCode("201")
      .message("startTimestamp(System.currentTimeMillis), endTimestamp(String, Format) [${start}, ${stopDateString}]")
    )
  setUp(scn.inject(atOnceUsers(1)).protocols(httpProtocol))
}

simulation.log

RUN	qaload.BasicSimulation	basicsimulation	1587578007201	open workload model	3.3.1
USER	Scenario Name	1	START	1587578008541	1587578008541
REQUEST	1		/ (GET)	1587578008577	1587578008945	OK	 
REQUEST	1		/ (GET) Redirect 1	1587578008975	1587578009038	OK	 
REQUEST	1		Generate req 1	1587578008546	1587578009069	OK	startTimestamp(System.currentTimeMillis), endTimestamp(System.currentTimeMillis)
REQUEST	1		Generate req 2	1587578008546	1587578009069	KO	500 Error Message
REQUEST	1		Generate req 3	1587578008546	1587578009069	OK	startDate(java.util.Date), endDate(java.util.Date) [Wed Apr 22 20:53:28 MSK 2020, Wed Apr 22 20:53:29 MSK 2020]
REQUEST	1		Generate req 4	1587578008546	1587578009069	OK	startTimestamp(String, Format), endTimestamp(String, Format) [2020-04-22 20:53:28.546 MSK, 2020-04-22 20:53:29.069 MSK]
REQUEST	1		Generate req 5	1587578008546	1587578009069	OK	startTimestamp(System.currentTimeMillis), endTimestamp(String, Format) [1587578008546, 2020-04-22 20:53:29.069 MSK]
USER	Scenario Name	1	END	1587578008541	1587578009086