diff --git a/internal/collector/process/process.go b/internal/collector/process/process.go
index eef2ca16..bd9bbc9c 100644
--- a/internal/collector/process/process.go
+++ b/internal/collector/process/process.go
@@ -76,6 +76,8 @@ type Collector struct {
 	poolBytes         *prometheus.Desc
 	priorityBase      *prometheus.Desc
 	privateBytes      *prometheus.Desc
+	// Deprecated: Use start_time_seconds_timestamp instead
+	startTimeOld      *prometheus.Desc
 	startTime         *prometheus.Desc
 	threadCount       *prometheus.Desc
 	virtualBytes      *prometheus.Desc
@@ -214,8 +216,15 @@ func (c *Collector) Build(logger *slog.Logger, miSession *mi.Session) error {
 		nil,
 	)
 
-	c.startTime = prometheus.NewDesc(
+	c.startTimeOld = prometheus.NewDesc(
 		prometheus.BuildFQName(types.Namespace, Name, "start_time"),
+		"DEPRECATED: Use start_time_seconds_timestamp instead",
+		[]string{"process", "process_id"},
+		nil,
+	)
+
+	c.startTime = prometheus.NewDesc(
+		prometheus.BuildFQName(types.Namespace, Name, "start_time_seconds_timestamp"),
 		"Time of process start.",
 		[]string{"process", "process_id"},
 		nil,
diff --git a/internal/collector/process/process_v1.go b/internal/collector/process/process_v1.go
index a50308af..5735fd88 100644
--- a/internal/collector/process/process_v1.go
+++ b/internal/collector/process/process_v1.go
@@ -141,6 +141,13 @@ func (c *Collector) collectWorkerV1() {
 				name, pidString,
 			)
 
+			ch <- prometheus.MustNewConstMetric(
+				c.startTimeOld,
+				prometheus.GaugeValue,
+				data.ElapsedTime,
+				name, pidString,
+			)
+
 			ch <- prometheus.MustNewConstMetric(
 				c.handleCount,
 				prometheus.GaugeValue,
diff --git a/internal/collector/process/process_v2.go b/internal/collector/process/process_v2.go
index 2e0d1a88..5f8488c4 100644
--- a/internal/collector/process/process_v2.go
+++ b/internal/collector/process/process_v2.go
@@ -23,6 +23,7 @@ import (
 	"strconv"
 	"strings"
 	"sync"
+	"time"
 
 	"github.com/prometheus-community/windows_exporter/internal/pdh"
 	"github.com/prometheus/client_golang/prometheus"
@@ -134,10 +135,19 @@ func (c *Collector) collectWorkerV2() {
 				name, pidString, parentPID, strconv.Itoa(int(processGroupID)), processOwner, cmdLine,
 			)
 
+			startTime := float64(time.Now().Unix() - int64(data.ElapsedTime))
+
+			ch <- prometheus.MustNewConstMetric(
+				c.startTimeOld,
+				prometheus.GaugeValue,
+				startTime,
+				name, pidString,
+			)
+
 			ch <- prometheus.MustNewConstMetric(
 				c.startTime,
 				prometheus.GaugeValue,
-				data.ElapsedTime,
+				startTime,
 				name, pidString,
 			)
 
diff --git a/internal/pdh/collector.go b/internal/pdh/collector.go
index 6a8672be..1aa68939 100644
--- a/internal/pdh/collector.go
+++ b/internal/pdh/collector.go
@@ -390,7 +390,7 @@ func (c *Collector) collectWorkerRaw() {
 						case PERF_ELAPSED_TIME:
 							dv.Index(index).
 								Field(counter.FieldIndexValue).
-								SetFloat(float64((item.RawValue.FirstValue - WindowsEpoch) / counter.Frequency))
+								SetFloat(float64((item.RawValue.SecondValue - item.RawValue.FirstValue) / counter.Frequency))
 						case PERF_100NSEC_TIMER, PERF_PRECISION_100NS_TIMER:
 							dv.Index(index).
 								Field(counter.FieldIndexValue).