diff --git a/default_formats.go b/default_formats.go
index d257f22..fd6e190 100644
--- a/default_formats.go
+++ b/default_formats.go
@@ -131,6 +131,13 @@ const (
 	DefaultFormatNbNODateTime = "15:04 02.01.06"
 	DefaultFormatNbNOTime     = "15:04"
 
+	DefaultFormatPlPLFull     = "Monday, 2 January 2006" // Polish (Poland)
+	DefaultFormatPlPLLong     = "2 January 2006"
+	DefaultFormatPlPLMedium   = "02 Jan 2006"
+	DefaultFormatPlPLShort    = "02.01.2006"
+	DefaultFormatPlPLDateTime = "02.01.2006, 15:04"
+	DefaultFormatPlPLTime     = "15:04"
+
 	DefaultFormatPtPTFull     = "Monday, 2 de January de 2006" // Portuguese (Portugal)
 	DefaultFormatPtPTLong     = "2 de January de 2006"
 	DefaultFormatPtPTMedium   = "02/01/2006"
diff --git a/format_pl_pl.go b/format_pl_pl.go
index 034f1bc..359e48e 100644
--- a/format_pl_pl.go
+++ b/format_pl_pl.go
@@ -40,6 +40,21 @@ var longMonthNamesPlPL = map[string]string{
 	"December":  "Grudzień",
 }
 
+var longMonthNamesGenitivePlPL = map[string]string{
+	"January":   "stycznia",
+	"February":  "lutego",
+	"March":     "marca",
+	"April":     "kwietnia",
+	"May":       "maja",
+	"June":      "czerwca",
+	"July":      "lipca",
+	"August":    "sierpnia",
+	"September": "września",
+	"October":   "października",
+	"November":  "listopada",
+	"December":  "grudnia",
+}
+
 var shortMonthNamesPlPL = map[string]string{
 	"Jan": "Sty",
 	"Feb": "Lut",
@@ -54,3 +69,18 @@ var shortMonthNamesPlPL = map[string]string{
 	"Nov": "Lis",
 	"Dec": "Gru",
 }
+
+var shortMonthNamesGenitivePlPL = map[string]string{
+	"Jan": "sty",
+	"Feb": "lut",
+	"Mar": "mar",
+	"Apr": "kwi",
+	"May": "maj",
+	"Jun": "cze",
+	"Jul": "lip",
+	"Aug": "sie",
+	"Sep": "wrz",
+	"Oct": "paź",
+	"Nov": "lis",
+	"Dec": "gru",
+}
diff --git a/monday.go b/monday.go
index 42564f0..15fa862 100644
--- a/monday.go
+++ b/monday.go
@@ -28,7 +28,7 @@ var internalFormatFuncs = map[Locale]internalFormatFunc{
 	LocaleItIT: createCommonFormatFunc(LocaleItIT),
 	LocaleNnNO: createCommonFormatFunc(LocaleNnNO),
 	LocaleNbNO: createCommonFormatFunc(LocaleNbNO),
-	LocalePlPL: createCommonFormatFunc(LocalePlPL),
+	LocalePlPL: createCommonFormatFuncWithGenitive(LocalePlPL),
 	LocalePtPT: createCommonFormatFunc(LocalePtPT),
 	LocalePtBR: createCommonFormatFunc(LocalePtBR),
 	LocaleRoRO: createCommonFormatFunc(LocaleRoRO),
@@ -80,7 +80,7 @@ var internalParseFuncs = map[Locale]internalParseFunc{
 	LocaleItIT: createCommonParseFunc(LocaleItIT),
 	LocaleNnNO: createCommonParseFunc(LocaleNnNO),
 	LocaleNbNO: createCommonParseFunc(LocaleNbNO),
-	LocalePlPL: parseFuncPtCommon(LocalePlPL),
+	LocalePlPL: createCommonParseFuncWithGenitive(LocalePlPL),
 	LocalePtPT: parseFuncPtCommon(LocalePtPT),
 	LocalePtBR: parseFuncPtCommon(LocalePtBR),
 	LocaleRoRO: createCommonParseFunc(LocaleRoRO),
@@ -248,6 +248,8 @@ func fillKnownWords() {
 	fillKnownDaysShort(shortDayNamesPlPL, LocalePlPL)
 	fillKnownMonthsLong(longMonthNamesPlPL, LocalePlPL)
 	fillKnownMonthsShort(shortMonthNamesPlPL, LocalePlPL)
+	fillKnownMonthsGenitiveLong(longMonthNamesGenitivePlPL, LocalePlPL)
+	fillKnownMonthsGenitiveShort(shortMonthNamesGenitivePlPL, LocalePlPL)
 
 	// Pt_PT: Portuguese (Portugal)
 	fillKnownDaysLong(longDayNamesPtPT, LocalePtPT)
diff --git a/monday_test.go b/monday_test.go
index c2ab4e2..1d90e12 100644
--- a/monday_test.go
+++ b/monday_test.go
@@ -179,11 +179,11 @@ var formatTests = []FormatTest{
 	{LocalePlPL, time.Date(2013, 9, 3, 0, 0, 0, 0, time.UTC), "Mon Jan 2 2006", "Wto Wrz 3 2013"},
 	{LocalePlPL, time.Date(2013, 9, 4, 0, 0, 0, 0, time.UTC), "Monday Jan 2 2006", "Środa Wrz 4 2013"},
 	{LocalePlPL, time.Date(2013, 10, 3, 0, 0, 0, 0, time.UTC), "Monday January 02 2006", "Czwartek Październik 03 2013"},
-	{LocalePlPL, time.Date(2013, 11, 3, 0, 0, 0, 0, time.UTC), "Monday. 2 January 2006", "Niedziela. 3 Listopad 2013"},
-	{LocalePlPL, time.Date(2013, 5, 13, 0, 0, 0, 0, time.UTC), "2006. 2 January. Monday", "2013. 13 Maj. Poniedziałek"},
-	{LocalePlPL, time.Date(2013, 5, 13, 0, 0, 0, 0, time.UTC), "2 Jan 2006", "13 Maj 2013"},
+	{LocalePlPL, time.Date(2013, 11, 3, 0, 0, 0, 0, time.UTC), "Monday. 2 January 2006", "Niedziela. 3 listopada 2013"},
+	{LocalePlPL, time.Date(2013, 5, 13, 0, 0, 0, 0, time.UTC), "2006. 2 January. Monday", "2013. 13 maja. Poniedziałek"},
+	{LocalePlPL, time.Date(2013, 5, 13, 0, 0, 0, 0, time.UTC), "2 Jan 2006", "13 maj 2013"},
 	{LocalePlPL, time.Date(0, 5, 1, 0, 0, 0, 0, time.UTC), "January", "Maj"},
-	{LocalePlPL, time.Date(0, 5, 13, 0, 0, 0, 0, time.UTC), "2 January", "13 Maj"},
+	{LocalePlPL, time.Date(0, 5, 13, 0, 0, 0, 0, time.UTC), "2 January", "13 maja"},
 
 	{LocalePtPT, time.Date(2013, 9, 3, 0, 0, 0, 0, time.UTC), "Mon Jan 2 2006", "ter Set 3 2013"},
 	{LocalePtPT, time.Date(2013, 9, 4, 0, 0, 0, 0, time.UTC), "Monday Jan 2 2006", "Quarta-feira Set 4 2013"},