diff --git a/public.tar b/public.tar
new file mode 100644
index 0000000..029e0bb
Binary files /dev/null and b/public.tar differ
diff --git a/server/ajax/form/form.go b/server/ajax/form/form.go
index 4539e3b..d9f0db2 100755
--- a/server/ajax/form/form.go
+++ b/server/ajax/form/form.go
@@ -7,6 +7,7 @@ import (
 	"io"
 	"io/ioutil"
 	"net/http"
+	"regexp"
 	"strconv"
 	"strings"
 	"time"
@@ -61,8 +62,34 @@ func ToStrArr(k string) []string {
 }
 
 func ToDuration(s string) time.Duration {
-	d, _ := time.ParseDuration(s)
-	return d
+	var d time.Duration
+	for _, c := range []struct {
+		key string
+		d   time.Duration
+	}{
+		{"d", time.Hour * 24},
+		{"w", time.Hour * 24 * 7},
+	} {
+		daysPattern := regexp.MustCompile(`(^|[a-z])[0-9]+` + c.key + `($|[0-9])`)
+		idxes := daysPattern.FindAllStringIndex(s, -1)
+		if len(idxes) > 1 {
+			return 0
+		}
+		for _, idx := range idxes {
+			substr := s[idx[0]:idx[1]]
+			for len(substr) > 0 && (substr[0] < '0' || substr[0] > '9') {
+				substr = substr[1:]
+			}
+			for len(substr) > 0 && (substr[len(substr)-1] >= '0' && substr[len(substr)-1] <= '9') {
+				substr = substr[:len(substr)-1]
+			}
+			substr = strings.TrimSuffix(substr, c.key)
+			n, _ := strconv.Atoi(substr)
+			d += c.d * time.Duration(n)
+		}
+	}
+	d2, _ := time.ParseDuration(s)
+	return d2 + d
 }
 
 func ToTime(s string) time.Time {
diff --git a/server/ajax/form/form_test.go b/server/ajax/form/form_test.go
index 0bbf482..1ec324d 100755
--- a/server/ajax/form/form_test.go
+++ b/server/ajax/form/form_test.go
@@ -5,6 +5,7 @@ import (
 	"net/http/httptest"
 	"strings"
 	"testing"
+	"time"
 )
 
 func TestGet(t *testing.T) {
@@ -142,3 +143,28 @@ func testReq() *http.Request {
       "d": "e, f,g"
    }`))
 }
+
+func TestToDuration(t *testing.T) {
+	cases := map[string]struct {
+		input string
+		want  time.Duration
+	}{
+		"invalid":            {},
+		"simple":             {input: "1s", want: time.Second},
+		"compound":           {input: "1m1s", want: time.Minute + time.Second},
+		"compound:unsorted":  {input: "1s1m", want: time.Minute + time.Second},
+		"extension:day":      {input: "1d", want: 24 * time.Hour},
+		"extension:week":     {input: "1w", want: 24 * 7 * time.Hour},
+		"extension:week,day": {input: "1w1d", want: 24 * 8 * time.Hour},
+	}
+
+	for name, d := range cases {
+		c := d
+		t.Run(name, func(t *testing.T) {
+			got := ToDuration(c.input)
+			if got != c.want {
+				t.Fatal(c.input, c.want, got)
+			}
+		})
+	}
+}