diff --git a/lang.de_test.go b/lang.de_test.go
new file mode 100755
index 00000000..13485a09
--- /dev/null
+++ b/lang.de_test.go
@@ -0,0 +1,260 @@
+package carbon
+
+import (
+	"strconv"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+var german = "de"
+
+func TestLang_German_Constellation(t *testing.T) {
+	assert := assert.New(t)
+
+	tests := []struct {
+		id       int    // 测试id
+		input    string // 输入值
+		expected string // 期望值
+	}{
+		{1, "", ""},
+		{2, "0", ""},
+		{3, "0000-00-00", ""},
+		{4, "00:00:00", ""},
+		{5, "0000-00-00 00:00:00", ""},
+
+		{6, "2020-01-05", "Steinbock"},
+		{7, "2020-02-05", "Wassermann"},
+		{8, "2020-03-05", "Fisch"},
+		{9, "2020-04-05", "Widder"},
+		{10, "2020-05-05", "Stier"},
+		{11, "2020-06-05", "Zwilling"},
+		{12, "2020-07-05", "Krebs"},
+		{13, "2020-08-05", "Löwe"},
+		{14, "2020-09-05", "Jungfrau"},
+		{15, "2020-10-05", "Waage"},
+		{16, "2020-11-05", "Skorpion"},
+		{17, "2020-12-05", "Schütze"},
+	}
+
+	for _, test := range tests {
+		c := SetTimezone(PRC).Parse(test.input).SetLocale(german)
+		assert.Nil(c.Error)
+		assert.Equal(test.expected, c.Constellation(), "Current test id is "+strconv.Itoa(test.id))
+	}
+}
+
+func TestLang_German_Season(t *testing.T) {
+	assert := assert.New(t)
+
+	tests := []struct {
+		id       int    // 测试id
+		input    string // 输入值
+		expected string // 期望值
+	}{
+		{1, "", ""},
+		{2, "0", ""},
+		{3, "0000-00-00", ""},
+		{4, "00:00:00", ""},
+		{5, "0000-00-00 00:00:00", ""},
+
+		{6, "2020-01-05", "Winter"},
+		{7, "2020-02-05", "Winter"},
+		{8, "2020-03-05", "Frühling"},
+		{9, "2020-04-05", "Frühling"},
+		{10, "2020-05-05", "Frühling"},
+		{11, "2020-06-05", "Sommer"},
+		{12, "2020-07-05", "Sommer"},
+		{13, "2020-08-05", "Sommer"},
+		{14, "2020-09-05", "Herbst"},
+		{15, "2020-10-05", "Herbst"},
+		{16, "2020-11-05", "Herbst"},
+		{17, "2020-12-05", "Winter"},
+	}
+
+	for _, test := range tests {
+		c := SetTimezone(PRC).Parse(test.input).SetLocale(german)
+		assert.Nil(c.Error)
+		assert.Equal(test.expected, c.Season(), "Current test id is "+strconv.Itoa(test.id))
+	}
+}
+
+func TestLang_German_ToMonthString(t *testing.T) {
+	assert := assert.New(t)
+
+	tests := []struct {
+		id       int    // 测试id
+		input    string // 输入值
+		expected string // 期望值
+	}{
+		{1, "", ""},
+		{2, "0", ""},
+		{3, "0000-00-00", ""},
+		{4, "00:00:00", ""},
+		{5, "0000-00-00 00:00:00", ""},
+
+		{6, "2020-01-05", "Januar"},
+		{7, "2020-02-05", "Februar"},
+		{8, "2020-03-05", "März"},
+		{9, "2020-04-05", "April"},
+		{10, "2020-05-05", "Mai"},
+		{11, "2020-06-05", "Juni"},
+		{12, "2020-07-05", "Juli"},
+		{13, "2020-08-05", "August"},
+		{14, "2020-09-05", "September"},
+		{15, "2020-10-05", "Oktober"},
+		{16, "2020-11-05", "November"},
+		{17, "2020-12-05", "Dezember"},
+	}
+
+	for _, test := range tests {
+		c := SetTimezone(PRC).Parse(test.input).SetLocale(german)
+		assert.Nil(c.Error)
+		assert.Equal(test.expected, c.ToMonthString(), "Current test id is "+strconv.Itoa(test.id))
+	}
+}
+
+func TestLang_German_ToShortMonthString(t *testing.T) {
+	assert := assert.New(t)
+
+	tests := []struct {
+		id       int    // 测试id
+		input    string // 输入值
+		expected string // 期望值
+	}{
+		{1, "", ""},
+		{2, "0", ""},
+		{3, "0000-00-00", ""},
+		{4, "00:00:00", ""},
+		{5, "0000-00-00 00:00:00", ""},
+
+		{6, "2020-01-05", "Jan"},
+		{7, "2020-02-05", "Feb"},
+		{8, "2020-03-05", "Mär"},
+		{9, "2020-04-05", "Apr"},
+		{10, "2020-05-05", "Mai"},
+		{11, "2020-06-05", "Jun"},
+		{12, "2020-07-05", "Jul"},
+		{13, "2020-08-05", "Aug"},
+		{14, "2020-09-05", "Sep"},
+		{15, "2020-10-05", "Okt"},
+		{16, "2020-11-05", "Nov"},
+		{17, "2020-12-05", "Dez"},
+	}
+
+	for _, test := range tests {
+		c := SetTimezone(PRC).Parse(test.input).SetLocale(german)
+		assert.Nil(c.Error)
+		assert.Equal(test.expected, c.ToShortMonthString(), "Current test id is "+strconv.Itoa(test.id))
+	}
+}
+
+func TestLang_German_ToWeekString(t *testing.T) {
+	assert := assert.New(t)
+
+	tests := []struct {
+		id       int    // 测试id
+		input    string // 输入值
+		expected string // 期望值
+	}{
+		{1, "", ""},
+		{2, "0", ""},
+		{3, "0000-00-00", ""},
+		{4, "00:00:00", ""},
+		{5, "0000-00-00 00:00:00", ""},
+
+		{6, "2020-08-01", "Samstag"},
+		{7, "2020-08-02", "Sonntag"},
+		{8, "2020-08-03", "Montag"},
+		{9, "2020-08-04", "Dienstag"},
+		{10, "2020-08-05", "Mittwoch"},
+		{11, "2020-08-06", "Donnerstag"},
+		{12, "2020-08-07", "Freitag"},
+	}
+
+	for _, test := range tests {
+		c := SetTimezone(PRC).Parse(test.input).SetLocale(german)
+		assert.Nil(c.Error)
+		assert.Equal(test.expected, c.ToWeekString(), "Current test id is "+strconv.Itoa(test.id))
+	}
+}
+
+func TestLang_German_ToShortWeekString(t *testing.T) {
+	assert := assert.New(t)
+
+	tests := []struct {
+		id       int    // 测试id
+		input    string // 输入值
+		expected string // 期望值
+	}{
+		{1, "", ""},
+		{2, "0", ""},
+		{3, "0000-00-00", ""},
+		{4, "00:00:00", ""},
+		{5, "0000-00-00 00:00:00", ""},
+
+		{6, "2020-08-01", "Sa"},
+		{7, "2020-08-02", "So"},
+		{8, "2020-08-03", "Mo"},
+		{9, "2020-08-04", "Di"},
+		{10, "2020-08-05", "Mi"},
+		{11, "2020-08-06", "Do"},
+		{12, "2020-08-07", "Fr"},
+	}
+
+	for _, test := range tests {
+		c := SetTimezone(PRC).Parse(test.input).SetLocale(german)
+		assert.Nil(c.Error)
+		assert.Equal(test.expected, c.ToShortWeekString(), "Current test id is "+strconv.Itoa(test.id))
+	}
+}
+
+func TestLang_German_DiffForHumans(t *testing.T) {
+	assert := assert.New(t)
+
+	tests := []struct {
+		id       int    // 测试id
+		input1   string // 输入值
+		input2   string // 输入值
+		expected string // 期望值
+	}{
+		{1, "2020-08-05 13:14:15", "2020-08-05 13:14:15", "gerade eben"},
+		{2, "2020-08-05 13:14:15", "2021-08-05 13:14:15", "1 Jahr davor"},
+		{3, "2020-08-05 13:14:15", "2019-08-05 13:14:15", "1 Jahr danach"},
+		{4, "2020-08-05 13:14:15", "2030-08-05 13:14:15", "10 Jahre davor"},
+		{5, "2020-08-05 13:14:15", "2010-08-05 13:14:15", "10 Jahre danach"},
+
+		{6, "2020-08-05 13:14:15", "2020-09-05 13:14:15", "1 Monat davor"},
+		{7, "2020-08-05 13:14:15", "2020-07-05 13:14:15", "1 Monat danach"},
+		{8, "2020-08-05 13:14:15", "2021-06-05 13:14:15", "10 Monate davor"},
+		{9, "2020-08-05 13:14:15", "2019-10-05 13:14:15", "10 Monate danach"},
+
+		{10, "2020-08-05 13:14:15", "2020-08-06 13:14:15", "1 Tag davor"},
+		{11, "2020-08-05 13:14:15", "2020-08-04 13:14:15", "1 Tag danach"},
+		{12, "2020-08-05 13:14:15", "2020-08-15 13:14:15", "1 Woche davor"},
+		{13, "2020-08-05 13:14:15", "2020-07-26 13:14:15", "1 Woche danach"},
+
+		{14, "2020-08-05 13:14:15", "2020-08-05 14:14:15", "1 Stunde davor"},
+		{15, "2020-08-05 13:14:15", "2020-08-05 12:14:15", "1 Stunde danach"},
+		{16, "2020-08-05 13:14:15", "2020-08-05 23:14:15", "10 Stunden davor"},
+		{17, "2020-08-05 13:14:15", "2020-08-05 03:14:15", "10 Stunden danach"},
+
+		{18, "2020-08-05 13:14:15", "2020-08-05 13:15:15", "1 Minute davor"},
+		{19, "2020-08-05 13:14:15", "2020-08-05 13:13:15", "1 Minute danach"},
+		{20, "2020-08-05 13:14:15", "2020-08-05 13:24:15", "10 Minuten davor"},
+		{21, "2020-08-05 13:14:15", "2020-08-05 13:04:15", "10 Minuten danach"},
+
+		{22, "2020-08-05 13:14:15", "2020-08-05 13:14:16", "1 Sekunde davor"},
+		{23, "2020-08-05 13:14:15", "2020-08-05 13:14:14", "1 Sekunde danach"},
+		{24, "2020-08-05 13:14:15", "2020-08-05 13:14:25", "10 Sekunden davor"},
+		{25, "2020-08-05 13:14:15", "2020-08-05 13:14:05", "10 Sekunden danach"},
+	}
+
+	for _, test := range tests {
+		c1 := Parse(test.input1)
+		c2 := Parse(test.input2)
+		assert.Nil(c1.Error)
+		assert.Nil(c2.Error)
+		assert.Equal(test.expected, c1.SetLocale(german).DiffForHumans(c2), "Current test id is "+strconv.Itoa(test.id))
+	}
+}
diff --git a/lang/de.json b/lang/de.json
new file mode 100755
index 00000000..95b241bf
--- /dev/null
+++ b/lang/de.json
@@ -0,0 +1,21 @@
+{
+	"months": "Januar|Februar|März|April|Mai|Juni|Juli|August|September|Oktober|November|Dezember",
+	"months_short": "Jan|Feb|Mär|Apr|Mai|Jun|Jul|Aug|Sep|Okt|Nov|Dez",
+	"weeks": "Sonntag|Montag|Dienstag|Mittwoch|Donnerstag|Freitag|Samstag",
+	"weeks_short": "So|Mo|Di|Mi|Do|Fr|Sa",
+	"seasons": "Frühling|Sommer|Herbst|Winter",
+	"constellations": "Widder|Stier|Zwilling|Krebs|Löwe|Jungfrau|Waage|Skorpion|Schütze|Steinbock|Wassermann|Fisch",
+
+	"year":"1 Jahr|%d Jahre",
+	"month":"1 Monat|%d Monate",
+	"week":"1 Woche|%d Wochen",
+	"day":"1 Tag|%d Tage",
+	"hour":"1 Stunde|%d Stunden",
+	"minute":"1 Minute|%d Minuten",
+	"second":"1 Sekunde|%d Sekunden",
+	"now": "gerade eben",
+	"ago":"vor %s",
+	"from_now":"%s ab jetzt",
+	"before":"%s davor",
+	"after":"%s danach"
+}