diff --git a/Date Calculator/Data calculater.py b/Date Calculator/Data calculater.py
new file mode 100644
index 0000000..89c30ef
--- /dev/null
+++ b/Date Calculator/Data calculater.py	
@@ -0,0 +1,112 @@
+from sly import Lexer, Parser
+import datetime
+class DateLexer(Lexer):
+    tokens = { DATE, PLUS,NUMBER, MINUS }
+    ignore = ' \t\n'
+    DATE = r'(?:0?[1-9]|[12][0-9]|3[01])/(?:Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec)/\d{4}'
+    PLUS = r'\+'
+    MINUS = r'-'
+    NUMBER=r'[0-9]+'
+
+
+class DateParser(Parser):
+    tokens = DateLexer.tokens
+
+    day_dict = [None, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
+
+    month_dict = {
+        'jan': 1,
+        'feb': 2,
+        'mar': 3,
+        'apr': 4,
+        'may': 5,
+        'jun': 6,
+        'jul': 7,
+        'aug': 8,
+        'sep': 9,
+        'oct': 10,
+        'nov': 11,
+        'dec': 12
+    }
+
+    @_('DATE')
+    def date(self, p):
+        return p.DATE
+
+    @_('date PLUS NUMBER')
+    def date(self, p):
+        day, month, year = p.date.split('/')
+        day = int(day)
+        year = int(year)
+
+        month_num = self.month_dict[month.lower()]
+        day += int(p.NUMBER)
+        while(day > self.day_dict[month_num]):
+            if day > self.day_dict[month_num]:
+                day -= self.day_dict[month_num]
+                month_num += 1
+            if month_num > 12:
+                month_num -= 12
+                year += 1
+            
+        return f'{day:02d}/{month_num}/{year}'
+        # {list(self.month_dict.keys())[list(self.month_dict.values()).index(month_num)].capitalize()}
+    @_('date MINUS NUMBER')
+    def date(self, p):
+        day, month, year = p.date.split('/')
+        day = int(day)
+        year = int(year)
+
+        month_num = self.month_dict[month.lower()]
+        day -= int(p.NUMBER)
+        if day == 0:
+            day += self.day_dict[month_num]
+            month_num -= 1
+            if month_num < 1:
+                month_num += 12
+                year -= 1
+        while(day < 0):
+        
+            day += self.day_dict[month_num]
+            month_num -= 1
+            if month_num < 1:
+                month_num += 12
+                year -= 1
+        # return f'{day:02d}/{list(self.month_dict.keys())[list(self.month_dict.values()).index(month_num)].capitalize()}/{year}'
+        return f'{day:02d}/{month_num}/{year}'
+
+    @_('date MINUS date')
+    def date(self,value):
+        day1, month1, year1 = value.date0.split('/')
+        day2, month2, year2 = value.date1.split('/')
+        day1 = int(day1)
+        year1 = int(year1)
+        day2 = int(day2)
+        year2 = int(year2)
+
+        month_num1 = self.month_dict[month1.lower()]
+        month_num2 = self.month_dict[month2.lower()]
+        # a=t[0].split('/')
+        # b=t[2].split('/')
+        
+        # print(a)
+        date1=datetime.date(year1,month_num1,day1)
+        date2=datetime.date(year2,month_num2,day2)
+        # print(date1)
+        # print(date2)
+        # print(abs((date1-date2).days))
+        return abs((date1-date2).days)
+
+lexer = DateLexer()
+parser = DateParser()
+
+data = '''
+            10/Nov/2023-365
+            '''
+tokens = lexer.tokenize(data)
+# for token in tokens:
+#     print(token.type, token.value)
+
+
+result = parser.parse(tokens)
+print(result)