add support for GINKGO_TIME_FORMAT

docs/index.md

@@ -3446,8 +3446,11 @@ When you [filter specs](#filtering-specs) using Ginkgo's various filtering mecha
 Here are a grab bag of other settings:
 
 You can disable Ginkgo's color output by running `ginkgo --no-color` or setting the `GINKGO_NO_COLOR=TRUE` environment variable.
+
 You can also output in a format that makes it easier to read in github actions console by running `ginkgo --github-output`.
 
+You can change how Ginkgo formats timestamps in the timeline by setting `GINKGO_TIME_FORMAT` to a valid Golang time format layout (e.g. `GINKGO_TIME_FORMAT=02/01/06 3:04:05.00`).
+
 By default, Ginkgo only emits full stack traces when a spec panics.  When a normal assertion failure occurs, Ginkgo simply emits the line at which the failure occurred.  You can, instead, have Ginkgo always emit the full stack trace by running `ginkgo --trace`.
 
 ### Reporting Infrastructure

types/types.go

@@ -3,13 +3,21 @@ package types
 import (
 	"encoding/json"
 	"fmt"
+	"os"
 	"sort"
 	"strings"
 	"time"
 )
 
 const GINKGO_FOCUS_EXIT_CODE = 197
-const GINKGO_TIME_FORMAT = "01/02/06 15:04:05.999"
+
+var GINKGO_TIME_FORMAT = "01/02/06 15:04:05.999"
+
+func init() {
+	if os.Getenv("GINKGO_TIME_FORMAT") != "" {
+		GINKGO_TIME_FORMAT = os.Getenv("GINKGO_TIME_FORMAT")
+	}
+}
 
 // Report captures information about a Ginkgo test run
 type Report struct {