diff --git a/date_darwin.go b/date_darwin.go
new file mode 100644
index 0000000..bc05c73
--- /dev/null
+++ b/date_darwin.go
@@ -0,0 +1,28 @@
+package zenity
+
+import (
+	"time"
+
+	"github.com/ncruces/zenity/internal/zenutil"
+)
+
+func calendar(text string, opts options) (time.Time, error) {
+	var date zenutil.Date
+
+	date.Date = time.Now().Unix()
+	date.Format = "yyyy-MM-dd"
+
+	if opts.title != nil {
+		date.Text = *opts.title
+		date.Info = text
+	} else {
+		date.Text = text
+	}
+
+	out, err := zenutil.Run(opts.ctx, "date", date)
+	str, err := strResult(opts, out, err)
+	if err != nil {
+		return time.Time{}, err
+	}
+	return time.Parse("2006-01-02", str)
+}
diff --git a/date_unix.go b/date_unix.go
index 7197150..9fcb7ac 100644
--- a/date_unix.go
+++ b/date_unix.go
@@ -1,4 +1,4 @@
-// +build !windows,!darwin
+//go:build !windows && !darwin
 
 package zenity
 
@@ -26,9 +26,9 @@ func calendar(text string, opts options) (time.Time, error) {
 	}
 
 	out, err := zenutil.Run(opts.ctx, args)
-	str, ok, err := strResult(opts, out, err)
-	if ok {
-		return time.Parse("2006-01-02", str)
+	str, err := strResult(opts, out, err)
+	if err != nil {
+		return time.Time{}, err
 	}
-	return time.Time{}, err
+	return time.Parse("2006-01-02", str)
 }
diff --git a/internal/zenutil/osa_generated.go b/internal/zenutil/osa_generated.go
index de571e3..c780ffb 100644
--- a/internal/zenutil/osa_generated.go
+++ b/internal/zenutil/osa_generated.go
@@ -19,6 +19,30 @@ app.activate()
 var res=app.chooseColor({defaultColor:{{json .}}})
 {'rgb('+res.map(x=>Math.round(x*255))+')'}
 {{- end}}
+{{define "date" -}}
+var app=Application.currentApplication()
+app.includeStandardAdditions=true
+app.activate()
+ObjC.import('Cocoa')
+ObjC.import('stdio')
+ObjC.import('stdlib')
+var date=$.NSDatePicker.alloc.init
+date.setDatePickerStyle($.NSDatePickerStyleClockAndCalendar)
+date.setDatePickerElements($.NSDatePickerElementFlagYearMonthDay)
+date.setDateValue($.NSDate.dateWithTimeIntervalSince1970({{.Date}}))
+date.setFrameSize(date.fittingSize)
+var alert=$.NSAlert.alloc.init
+alert.setAccessoryView(date)
+alert.setMessageText({{json .Text}})
+{{- if .Info}}alert.setInformativeText({{json .Info}}){{- end}}
+{{- range .Buttons}}alert.addButtonWithTitle([{{json .}}]){{end}}
+var res=alert.runModal
+switch(res){case $.NSAlertThirdButtonReturn:$.puts({{json .Buttons}}[2])
+case $.NSAlertSecondButtonReturn:$.exit(1)}
+var fmt=$.NSDateFormatter.alloc.init
+fmt.dateFormat={{json .Format}}
+fmt.stringFromDate(date.dateValue)
+{{- end}}
 {{define "dialog" -}}
 var app=Application.currentApplication()
 app.includeStandardAdditions=true
diff --git a/internal/zenutil/osascripts/date.gojs b/internal/zenutil/osascripts/date.gojs
new file mode 100644
index 0000000..a4f7125
--- /dev/null
+++ b/internal/zenutil/osascripts/date.gojs
@@ -0,0 +1,31 @@
+var app = Application.currentApplication()
+app.includeStandardAdditions = true
+app.activate()
+
+ObjC.import('Cocoa')
+ObjC.import('stdio')
+ObjC.import('stdlib')
+
+var date = $.NSDatePicker.alloc.init
+date.setDatePickerStyle($.NSDatePickerStyleClockAndCalendar)
+date.setDatePickerElements($.NSDatePickerElementFlagYearMonthDay)
+date.setDateValue($.NSDate.dateWithTimeIntervalSince1970({{.Date}}))
+date.setFrameSize(date.fittingSize)
+
+var alert = $.NSAlert.alloc.init
+alert.setAccessoryView(date)
+alert.setMessageText({{json .Text}})
+{{- if .Info}}alert.setInformativeText({{json .Info}}){{- end}}
+{{- range .Buttons}}alert.addButtonWithTitle([{{json .}}]){{end}}
+
+var res = alert.runModal
+switch (res) {
+case $.NSAlertThirdButtonReturn:
+	$.puts({{json .Buttons}}[2])
+case $.NSAlertSecondButtonReturn:
+	$.exit(1)
+}
+
+var fmt = $.NSDateFormatter.alloc.init
+fmt.dateFormat = {{json .Format}}
+fmt.stringFromDate(date.dateValue)
\ No newline at end of file
diff --git a/internal/zenutil/run_darwin.go b/internal/zenutil/run_darwin.go
index d7e9b87..663c0ec 100644
--- a/internal/zenutil/run_darwin.go
+++ b/internal/zenutil/run_darwin.go
@@ -216,3 +216,12 @@ type Progress struct {
 	Description *string
 	Total       *int
 }
+
+// Date is internal.
+type Date struct {
+	Date    int64
+	Text    string
+	Info    string
+	Format  string
+	Buttons []string
+}