fix(logs): restore ISO 8601 timestamp format (#9493)

wiegandf · web-flow · commit 2621405de360 · 2026-07-16T08:37:39.000-07:00
* fix(logs): restore ISO 8601 timestamp format

Signed-off-by: Florian Wiegand &lt;florian.wiegand@sap.com&gt;

* fix(logs): add release note for ISO 8601 timestamp fix

Signed-off-by: Florian Wiegand &lt;florian.wiegand@sap.com&gt;

---------

Signed-off-by: Florian Wiegand &lt;florian.wiegand@sap.com&gt;
diff --git a/internal/logging/log.go b/internal/logging/log.go
@@ -136,6 +136,7 @@ func (l Logger) Sugar() *zap.SugaredLogger {
 func initZapLogger(w io.Writer, logging *egv1a1.EnvoyGatewayLogging, level egv1a1.LogLevel) *zap.Logger {
 	parseLevel, _ := zapcore.ParseLevel(string(logging.DefaultEnvoyGatewayLoggingLevel(level)))
 	cfg := zap.NewProductionEncoderConfig()
+	cfg.EncodeTime = zapcore.ISO8601TimeEncoder
 	var encoder zapcore.Encoder
 	logEncoder := egv1a1.EnvoyGatewayLogEncoderText
 	if logging != nil && logging.Encoder != nil {
diff --git a/release-notes/current/bug_fixes/9492-logs-restore-iso8601-timestamp-format.md b/release-notes/current/bug_fixes/9492-logs-restore-iso8601-timestamp-format.md
@@ -0,0 +1 @@
+Fixed log timestamps regressing to Unix epoch floats (e.g. `1.784e+09`) since v1.8.0 by explicitly setting `ISO8601TimeEncoder` on the production zap encoder config, restoring the expected ISO 8601 format (e.g. `2026-07-14T17:44:06.617Z`).

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1 @@`
	`1`	+Fixed log timestamps regressing to Unix epoch floats (e.g. `1.784e+09`) since v1.8.0 by explicitly setting `ISO8601TimeEncoder` on the production zap encoder config, restoring the expected ISO 8601 format (e.g. `2026-07-14T17:44:06.617Z`).