Add clock cli flag

Close #8787

tpl/collections/collections.go

@@ -35,6 +35,7 @@ import (
 )
 
 func init() {
+	// htime.Now cannot be used here
 	rand.Seed(time.Now().UTC().UnixNano())
 }
 

tpl/partials/partials.go

@@ -25,8 +25,8 @@ import (
 	"reflect"
 	"strings"
 	"sync"
-	"time"
 
+	"github.com/gohugoio/hugo/common/htime"
 	texttemplate "github.com/gohugoio/hugo/tpl/internal/go_templates/texttemplate"
 
 	"github.com/gohugoio/hugo/helpers"
@@ -222,7 +222,7 @@ func createKey(name string, variants ...any) (partialCacheKey, error) {
 var errUnHashable = errors.New("unhashable")
 
 func (ns *Namespace) getOrCreate(ctx context.Context, key partialCacheKey, context any) (result any, err error) {
-	start := time.Now()
+	start := htime.Now()
 	defer func() {
 		if r := recover(); r != nil {
 			err = r.(error)

tpl/time/init.go

@@ -28,6 +28,7 @@ func init() {
 		if d.Language == nil {
 			panic("Language must be set")
 		}
+
 		ctx := New(langs.GetTimeFormatter(d.Language), langs.GetLocation(d.Language))
 
 		ns := &internal.TemplateFuncsNamespace{

tpl/time/time.go

@@ -68,9 +68,9 @@ func (ns *Namespace) Format(layout string, v any) (string, error) {
 	return ns.timeFormatter.Format(t, layout), nil
 }
 
-// Now returns the current local time.
+// Now returns the current local time or `clock` time
 func (ns *Namespace) Now() _time.Time {
-	return _time.Now()
+	return htime.Now()
 }
 
 // ParseDuration parses the duration string s.

tpl/tplimpl/template.go

@@ -27,10 +27,10 @@ import (
 	"sort"
 	"strings"
 	"sync"
-	"time"
 	"unicode"
 	"unicode/utf8"
 
+	"github.com/gohugoio/hugo/common/htime"
 	"github.com/gohugoio/hugo/common/types"
 
 	"github.com/gohugoio/hugo/helpers"
@@ -235,7 +235,7 @@ func (t *templateExec) ExecuteWithContext(ctx context.Context, templ tpl.Templat
 		defer rlocker.RUnlock()
 	}
 	if t.Metrics != nil {
-		defer t.Metrics.MeasureSince(templ.Name(), time.Now())
+		defer t.Metrics.MeasureSince(templ.Name(), htime.Now())
 	}
 
 	if t.templateUsageTracker != nil {