diff --git a/21_Calendar/python/calendar.py b/21_Calendar/python/calendar.py
new file mode 100644
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+++ b/21_Calendar/python/calendar.py
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+########################################################
+# Calendar
+#
+# From: BASIC Computer Games (1978)
+#       Edited by David Ahl#
+#
+#    This program prints out a calendar
+# for any year. You must specify the
+# starting day of the week of the year in
+# statement 130. (Sunday(0), Monday
+# (-1), Tuesday(-2), etc.) You can determine
+# this by using the program WEEKDAY.
+# You must also make two changes
+# for leap years in statement 360 and 620.
+# The program listing describes the necessary
+# changes. Running the program produces a
+# nice 12-month calendar.
+#    The program was written by Geofrey
+# Chase of the Abbey, Portsmouth, Rhode Island.
+#
+########################################################
+
+def parse_input():
+    """
+    function to parse input for weekday and leap year boolean
+    """
+
+    days_mapping = {
+        "sunday": 0,
+        "monday": -1,
+        "tuesday": -2,
+        "wednesday": -3,
+        "thursday": -4,
+        "friday": -5,
+        "saturday": -6
+    }
+
+    day = 0
+    leap_day = False
+
+    correct_day_input = False
+    while not correct_day_input:
+        weekday = input("INSERT THE STARTING DAY OF THE WEEK OF THE YEAR:")
+
+        for day_k in days_mapping.keys():
+            if weekday.lower() in day_k:
+                day = days_mapping[day_k]
+                correct_day_input = True
+                break
+
+    while True:
+        leap = input("IS IT A LEAP YEAR?:")
+
+        if 'y' in leap.lower():
+            leap_day = True
+            break
+
+        if 'n' in leap.lower():
+            leap_day = False
+            break
+
+    return day, leap_day
+
+
+def calendar(weekday, leap_year):
+    """
+    function to print a year's calendar.
+
+    input: 
+        _weekday_: int - the initial day of the week (0=SUN, -1=MON, -2=TUES...)
+        _leap_year_: bool - indicates if the year is a leap year
+    """
+    months_days = [0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
+    days = 'S        M        T        W        T        F        S\n'
+    sep = "*" * 59
+    years_day = 365
+    d = weekday
+
+    if leap_year:
+        months_days[2] = 29
+        years_day = 366
+
+    months_names = [" JANUARY ",
+                    " FEBRUARY",
+                    "  MARCH  ",
+                    "  APRIL  ",
+                    "   MAY   ",
+                    "   JUNE  ",
+                    "   JULY  ",
+                    "  AUGUST ",
+                    "SEPTEMBER",
+                    " OCTOBER ",
+                    " NOVEMBER",
+                    " DECEMBER"]
+
+    days_count = 0  # S in the original program
+
+    # main loop
+    for n in range(1, 13):
+        days_count += months_days[n-1]
+        print("** {} ****************** {} ****************** {} **\n".format(days_count,
+                                                                              months_names[n-1], years_day-days_count))
+        print(days)
+        print(sep)
+
+        for w in range(1, 7):
+            print("\n")
+            for g in range(1, 8):
+                d += 1
+                d2 = d - days_count
+
+                if d2 > months_days[n]:
+                    break
+
+                if d2 <= 0:
+                    print("{}".format('  '), end='       ')
+                elif d2 < 10:
+                    print(" {}".format(d2), end='       ')
+                else:
+                    print("{}".format(d2), end='       ')
+            print()
+
+            if d2 >= months_days[n]:
+                break
+
+        if d2 > months_days[n]:
+            d -= g
+
+        print("\n")
+
+    print("\n")
+
+
+def main():
+    print(" "*32 + "CALENDAR")
+    print(" "*15 + "CREATIVE COMPUTING  MORRISTOWN, NEW JERSEY")
+    print("\n"*11)
+
+    day, leap_year = parse_input()
+    calendar(day, leap_year)
+
+
+if __name__ == "__main__":
+    main()
+
+########################################################
+#
+########################################################
+#
+# Porting notes:
+#
+# It has been added an input at the beginning of the
+# program so the user can specify the first day of the
+# week of the year and if the year is leap or not.
+#
+########################################################