solution/m1-005

projects/005-gregorian-date-to-ordinal-date/python/main.py

@@ -0,0 +1,57 @@
+from datetime import datetime
+
+def gregorian_to_ordinal_date(day,month,year):
+    start_date=datetime(year,1,1)
+    input_date=datetime(year,month,day)
+    difference_date=input_date-start_date
+    ordinal_number=difference_date.days+1
+    ordinal_date=f"{year}-{ordinal_number:03}"
+    return ordinal_date
+
+def is_leap_year(year):
+    if year%400==0 or (year%4==0 and year%100!=0):
+        return True
+    else:
+        return False
+
+def main():
+    is_valid_year=False
+    while not(is_valid_year):
+        input_year=input("Enter year of the date: ")
+        if input_year.isnumeric() and int(input_year)>0:
+            input_year=int(input_year)
+            is_valid_year=True
+
+    is_valid_month=False
+    while not(is_valid_month):
+        input_month=input("Enter month of the date: ")
+        if input_month.isnumeric() and int(input_month)>0 and int(input_month)<13:
+            input_month=int(input_month)
+            is_valid_month=True
+
+    is_valid_day=False
+    while not(is_valid_day):
+        input_day=input("Enter day of the date: ")
+        if input_day.isnumeric():
+            if input_month==2:
+                if is_leap_year(input_year) and int(input_day)>0 and int(input_day)<30:
+                    input_day=int(input_day) 
+                    is_valid_day=True
+                else:
+                    if int(input_day)>0 and int(input_day)<29:
+                        input_day=int(input_day) 
+                        is_valid_day=True
+            elif input_month==4 or input_month==6 or input_month==9 or input_month==11:
+                if int(input_day)>0 and int(input_day)<31:
+                    input_day=int(input_day)
+                    is_valid_day=True
+            else:
+                if int(input_day)>0 and int(input_day)<32:
+                    input_day=int(input_day)
+                    is_valid_day=True
+
+    ordinal_date=gregorian_to_ordinal_date(input_day,input_month,input_year)
+    print(f"{input_year}-{input_month:02}-{input_day:02} = {ordinal_date:03}")
+
+if __name__=="__main__":
+    main()