diff --git a/HISTORY.md b/HISTORY.md
index fbdcdba6..899516b2 100644
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -28,6 +28,8 @@ The codebase for Dependency Injection, Internationalization and localization and
 
 ## Fixes and Improvements
 
+- Add [x/jsonx: DayTime](/x/jsonx/day_time.go) for JSON marshal and unmarshal of "15:04:05" (hour, minute, second).
+
 - Fix a bug of `WithoutBodyConsumptionOnUnmarshal` configurator and a minor dependency injection issue caused by the previous alpha version between 20 and 26 February of 2022.
 
 - New basic [cors middleware](middleware/cors).
diff --git a/x/client/client.go b/x/client/client.go
index 299b9b3c..c77fd044 100644
--- a/x/client/client.go
+++ b/x/client/client.go
@@ -121,7 +121,7 @@ func (c *Client) emitEndRequest(ctx context.Context, resp *http.Response, err er
 // RequestOption declares the type of option one can pass
 // to the Do methods(JSON, Form, ReadJSON...).
 // Request options run before request constructed.
-type RequestOption func(*http.Request) error
+type RequestOption = func(*http.Request) error
 
 // We always add the following request headers, unless they're removed by custom ones.
 var defaultRequestOptions = []RequestOption{
diff --git a/x/client/option.go b/x/client/option.go
index f3a1e950..dd53be1e 100644
--- a/x/client/option.go
+++ b/x/client/option.go
@@ -13,7 +13,7 @@ import (
 
 // All the builtin client options should live here, for easy discovery.
 
-type Option func(*Client)
+type Option = func(*Client)
 
 // BaseURL registers the base URL of this client.
 // All of its methods will prepend this url.
diff --git a/x/jsonx/day_time.go b/x/jsonx/day_time.go
new file mode 100644
index 00000000..a39b337d
--- /dev/null
+++ b/x/jsonx/day_time.go
@@ -0,0 +1,100 @@
+package jsonx
+
+import (
+	"fmt"
+	"strconv"
+	"strings"
+	"time"
+)
+
+const (
+	// DayTimeLayout holds the time layout for the the format of "hour:minute:second", hour can be 15, meaning 3 PM.
+	DayTimeLayout = "15:04:05"
+)
+
+// DayTime describes a time compatible with DayTimeLayout.
+type DayTime time.Time
+
+// ParseDayTime reads from "s" and returns the DayTime time.
+func ParseDayTime(s string) (DayTime, error) {
+	if s == "" || s == "null" {
+		return DayTime{}, nil
+	}
+
+	tt, err := time.Parse(DayTimeLayout, s)
+	if err != nil {
+		return DayTime{}, err
+	}
+
+	return DayTime(tt), nil
+}
+
+// UnmarshalJSON parses the "b" into DayTime time.
+func (t *DayTime) UnmarshalJSON(b []byte) error {
+	if len(b) == 0 {
+		return nil
+	}
+
+	s := strings.Trim(string(b), `"`)
+	tt, err := ParseDayTime(s)
+	if err != nil {
+		return err
+	}
+
+	*t = tt
+	return nil
+}
+
+// MarshalJSON writes a quoted string in the DayTime time format.
+func (t DayTime) MarshalJSON() ([]byte, error) {
+	if s := t.String(); s != "" {
+		s = strconv.Quote(s)
+		return []byte(s), nil
+	}
+
+	return nullLiteral, nil // Note: if the front-end wants an empty string instead I must change that.
+}
+
+// ToTime returns the unwrapped *t to time.Time.
+func (t *DayTime) ToTime() time.Time {
+	tt := time.Time(*t)
+	return tt
+}
+
+// IsZero reports whether "t" is zero time.
+func (t DayTime) IsZero() bool {
+	return time.Time(t).IsZero()
+}
+
+// String returns the text representation of the "t" using the DayTime time layout.
+func (t DayTime) String() string {
+	tt := t.ToTime()
+	if tt.IsZero() {
+		return ""
+	}
+
+	return tt.Format(DayTimeLayout)
+}
+
+// Scan completes the sql driver.Scanner interface.
+func (t *DayTime) Scan(src interface{}) error {
+	switch v := src.(type) {
+	case time.Time: // type was set to timestamp
+		if v.IsZero() {
+			return nil // don't set zero, ignore it.
+		}
+		*t = DayTime(v)
+	case string:
+		tt, err := ParseDayTime(v)
+		if err != nil {
+			return err
+		}
+		*t = tt
+	case nil:
+		*t = DayTime(time.Time{})
+	default:
+		return fmt.Errorf("DayTime: unknown type of: %T", v)
+	}
+
+	return nil
+}
diff --git a/x/jsonx/day_time_test.go b/x/jsonx/day_time_test.go
new file mode 100644
index 00000000..035a6148
--- /dev/null
+++ b/x/jsonx/day_time_test.go
@@ -0,0 +1,52 @@
+package jsonx
+
+import (
+	"encoding/json"
+	"testing"
+	"time"
+)
+
+func TestDayTime(t *testing.T) {
+	tests := []struct {
+		rawData string
+	}{
+		{
+			rawData: `{"start": "8:33:00", "end": "15:00:42", "nothing": null, "empty": ""}`,
+		},
+		{
+			rawData: `{"start": "8:33:00", "end": "15:00:42", "nothing": null, "empty": ""}`,
+		},
+	}
+
+	for _, tt := range tests {
+		v := struct {
+			Start   DayTime `json:"start"`
+			End     DayTime `json:"end"`
+			Nothing DayTime `json:"nothing"`
+			Empty   DayTime `json:"empty"`
+		}{}
+
+		err := json.Unmarshal([]byte(tt.rawData), &v)
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		if !v.Nothing.IsZero() {
+			t.Fatalf("expected 'nothing' to be zero but got: %v", v.Nothing)
+		}
+
+		if !v.Empty.IsZero() {
+			t.Fatalf("expected 'empty' to be zero but got: %v", v.Empty)
+		}
+
+		loc := time.UTC
+
+		if expected, got := time.Date(0, time.January, 1, 8, 33, 0, 0, loc), v.Start.ToTime(); expected != got {
+			t.Fatalf("expected 'start' to be: %v but got: %v", expected, got)
+		}
+
+		if expected, got := time.Date(0, time.January, 1, 15, 0, 42, 0, loc), v.End.ToTime(); expected != got {
+			t.Fatalf("expected 'start' to be: %v but got: %v", expected, got)
+		}
+	}
+}