diff --git a/daes/go.mod b/daes/go.mod
new file mode 100644
index 00000000..92ab1c76
--- /dev/null
+++ b/daes/go.mod
@@ -0,0 +1,3 @@
+module gopkg.in/dtapps/go-library.v2/daes
+
+go 1.16
diff --git a/daes/v20210726/aes.go b/daes/v20210726/aes.go
new file mode 100644
index 00000000..e4bd387a
--- /dev/null
+++ b/daes/v20210726/aes.go
@@ -0,0 +1,57 @@
+package v20210726
+
+import (
+	"bytes"
+	"crypto/aes"
+	"crypto/cipher"
+	"encoding/base64"
+)
+
+// Encrypt 加密 aes_128_cbc
+func Encrypt(encryptStr string, key []byte, iv string) (string, error) {
+	encryptBytes := []byte(encryptStr)
+	block, err := aes.NewCipher(key)
+	if err != nil {
+		return "", err
+	}
+
+	blockSize := block.BlockSize()
+	encryptBytes = pkcs5Padding(encryptBytes, blockSize)
+
+	blockMode := cipher.NewCBCEncrypter(block, []byte(iv))
+	encrypted := make([]byte, len(encryptBytes))
+	blockMode.CryptBlocks(encrypted, encryptBytes)
+	return base64.URLEncoding.EncodeToString(encrypted), nil
+}
+
+// Decrypt 解密
+func Decrypt(decryptStr string, key []byte, iv string) (string, error) {
+	decryptBytes, err := base64.URLEncoding.DecodeString(decryptStr)
+	if err != nil {
+		return "", err
+	}
+
+	block, err := aes.NewCipher(key)
+	if err != nil {
+		return "", err
+	}
+
+	blockMode := cipher.NewCBCDecrypter(block, []byte(iv))
+	decrypted := make([]byte, len(decryptBytes))
+
+	blockMode.CryptBlocks(decrypted, decryptBytes)
+	decrypted = pkcs5UnPadding(decrypted)
+	return string(decrypted), nil
+}
+
+func pkcs5Padding(cipherText []byte, blockSize int) []byte {
+	padding := blockSize - len(cipherText)%blockSize
+	padText := bytes.Repeat([]byte{byte(padding)}, padding)
+	return append(cipherText, padText...)
+}
+
+func pkcs5UnPadding(decrypted []byte) []byte {
+	length := len(decrypted)
+	unPadding := int(decrypted[length-1])
+	return decrypted[:(length - unPadding)]
+}
diff --git a/dtime/go.mod b/dtime/go.mod
new file mode 100644
index 00000000..a52e53c1
--- /dev/null
+++ b/dtime/go.mod
@@ -0,0 +1,3 @@
+module gopkg.in/dtapps/go-library.v2/dtime
+
+go 1.16
diff --git a/dtime/v20210726/time.go b/dtime/v20210726/time.go
new file mode 100644
index 00000000..62c327a4
--- /dev/null
+++ b/dtime/v20210726/time.go
@@ -0,0 +1,42 @@
+package v20210726
+
+import "time"
+
+const (
+	RFC822Format  = "Mon, 02 Jan 2006 15:04:05 MST"
+	ISO8601Format = "2006-01-02T15:04:05Z"
+)
+
+func NowUTCSeconds() int64 { return time.Now().UTC().Unix() }
+
+func NowUTCNanoSeconds() int64 { return time.Now().UTC().UnixNano() }
+
+// GetCurrentDate 获取当前的时间 - 字符串
+func GetCurrentDate() string {
+	return time.Now().Format("2006/01/02 15:04:05")
+}
+
+// GetCurrentUnix 获取当前的时间 - Unix时间戳
+func GetCurrentUnix() int64 {
+	return time.Now().Unix()
+}
+
+// GetCurrentMilliUnix 获取当前的时间 - 毫秒级时间戳
+func GetCurrentMilliUnix() int64 {
+	return time.Now().UnixNano() / 1000000
+}
+
+// GetCurrentNanoUnix 获取当前的时间 - 纳秒级时间戳
+func GetCurrentNanoUnix() int64 {
+	return time.Now().UnixNano()
+}
+
+// GetCurrentWjDate 获取当前的时间 - 字符串 - 没有间隔
+func GetCurrentWjDate() string {
+	return time.Now().Format("20060102")
+}
+
+func FormatISO8601Date(timestampSecond int64) string {
+	tm := time.Unix(timestampSecond, 0).UTC()
+	return tm.Format(ISO8601Format)
+}
diff --git a/dtime/v20210726/time_example.go b/dtime/v20210726/time_example.go
new file mode 100644
index 00000000..57b0dc94
--- /dev/null
+++ b/dtime/v20210726/time_example.go
@@ -0,0 +1,11 @@
+package v20210726
+
+import "fmt"
+
+func main() {
+	fmt.Println(GetCurrentDate())
+	fmt.Println(GetCurrentUnix())
+	fmt.Println(GetCurrentMilliUnix())
+	fmt.Println(GetCurrentNanoUnix())
+	fmt.Println(GetCurrentWjDate())
+}
diff --git a/dtime/v20210726/time_test.go b/dtime/v20210726/time_test.go
new file mode 100644
index 00000000..f669352e
--- /dev/null
+++ b/dtime/v20210726/time_test.go
@@ -0,0 +1,14 @@
+package v20210726
+
+import (
+	"fmt"
+	"testing"
+)
+
+func TestName(t *testing.T) {
+	fmt.Println(GetCurrentDate())
+	fmt.Println(GetCurrentUnix())
+	fmt.Println(GetCurrentMilliUnix())
+	fmt.Println(GetCurrentNanoUnix())
+	fmt.Println(GetCurrentWjDate())
+}
diff --git a/request/request.go b/request/request.go
index c449413e..7b930d49 100644
--- a/request/request.go
+++ b/request/request.go
@@ -6,6 +6,7 @@ import (
 	"net"
 	"net/http"
 	"strings"
+	"time"
 )
 
 // ClientIp 尽最大努力实现获取客户端 IP 的算法。
@@ -50,6 +51,11 @@ func GetUserAgent() string {
 	return userAgentList[rand.Intn(len(userAgentList))]
 }
 
+func GetRandomUserAgent() string {
+	r := rand.New(rand.NewSource(time.Now().UnixNano()))
+	return userAgentList[r.Intn(len(userAgentList))]
+}
+
 var userAgentList = []string{
 	"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.77 Safari/537.36",
 	"Mozilla/5.0 (Windows NT 6.2; WOW64) AppleWebKit/537.36 (KHTML like Gecko) Chrome/44.0.2403.155 Safari/537.36",
diff --git a/time/time_example.go b/time/time_example.go
new file mode 100644
index 00000000..925fcd5f
--- /dev/null
+++ b/time/time_example.go
@@ -0,0 +1,11 @@
+package time
+
+import "fmt"
+
+func main() {
+	fmt.Println(GetCurrentDate())
+	fmt.Println(GetCurrentUnix())
+	fmt.Println(GetCurrentMilliUnix())
+	fmt.Println(GetCurrentNanoUnix())
+	fmt.Println(GetCurrentWjDate())
+}
diff --git a/time/time_test.go b/time/time_test.go
index 66995b1c..52e9d146 100644
--- a/time/time_test.go
+++ b/time/time_test.go
@@ -1,14 +1,14 @@
 package time
 
 import (
-	"log"
+	"fmt"
 	"testing"
 )
 
 func TestName(t *testing.T) {
-	log.Println(GetCurrentDate())
-	log.Println(GetCurrentUnix())
-	log.Println(GetCurrentMilliUnix())
-	log.Println(GetCurrentNanoUnix())
-	log.Println(GetCurrentWjDate())
+	fmt.Println(GetCurrentDate())
+	fmt.Println(GetCurrentUnix())
+	fmt.Println(GetCurrentMilliUnix())
+	fmt.Println(GetCurrentNanoUnix())
+	fmt.Println(GetCurrentWjDate())
 }