diff --git a/Age Calculator/calculate.py b/Age Calculator/calculate.py
index 83134f0..a5756bb 100644
--- a/Age Calculator/calculate.py	
+++ b/Age Calculator/calculate.py	
@@ -1,25 +1,25 @@
 import time
 from calendar import isleap
 
-def judge_leap_year(year):
-    if isleap(year):
-        return True
-    else:
-        return False
+# Check if a year is a leap year
+def judge_leap(year: int) -> bool:
+    return isleap(year)
 
-def month_days(month, leap_year):
+# Return number of days in a month, considering leap years
+def month_days(month: int, leap_year: bool) -> int:
     if month in [1, 3, 5, 7, 8, 10, 12]:
         return 31
     elif month in [4, 6, 9, 11]:
         return 30
     elif month == 2 and leap_year:
         return 29
-    elif month == 2 and (not leap_year):
+    else:
         return 28
 
-
+# User input
 name = input("Please enter your name: ")
-age = input("Please enter your age: ")
+age = int(input("Please enter your age: "))
+
 localtime = time.localtime(time.time())
 
 year = int(age)
@@ -29,16 +29,25 @@ def month_days(month, leap_year):
 begin_year = int(localtime.tm_year) - year
 end_year = begin_year + year
 
+# Count days in past years
 for y in range(begin_year, end_year):
-    if (judge_leap_year(y)):
-        day = day + 366
+    if judge_leap(y):
+        day += 366
     else:
-        day = day + 365
+        day += 365
 
-leap_year = judge_leap_year(localtime.tm_year)
+# Add days from current year
+leap_year = judge_leap(localtime.tm_year)
 for m in range(1, localtime.tm_mon):
-    day = day + month_days(m, leap_year)
-
-day = day + localtime.tm_mday
-print("\n\t%s's age is %d years or " % (name, year), end="")
-print("%d months or %d days" % (month, day))
+    day += month_days(m, leap_year)
+
+# Approximate breakdown (ignores time of day)
+hours = day * 24
+minutes = hours * 60
+seconds = minutes * 60
+
+print(f"\nHello {name}, you are approximately:")
+print(f"  {day:,} days")
+print(f"  {hours:,} hours")
+print(f"  {minutes:,} minutes")
+print(f"  {seconds:,} seconds old!")
diff --git a/Digital Clock/main.py b/Digital Clock/main.py
index 831562b..632af37 100644
--- a/Digital Clock/main.py	
+++ b/Digital Clock/main.py	
@@ -1,5 +1,5 @@
 from time import strftime
-from tkinter import Label, Tk
+from tkinter import Label, Tk , Button
 
 window = Tk()
 window.title("Digital Clock")
@@ -7,17 +7,44 @@
 window.configure(bg="green")
 window.resizable(False, False) 
 
+use_24h = True
+
 clock_label = Label(
     window, bg="black", fg="green", font=("Arial", 30, "bold"), relief="flat"
 )
 clock_label.place(x=50, y=50)
 
 
+date_label = Label(
+    window, bg="black", fg="white", font=("Arial", 14)
+)
+date_label.pack(pady=(0, 10), anchor="center")
+
+
+
+def toggle_format(_evt=None):
+    global use_24h
+    use_24h = not use_24h
+    fmt_btn.config(text="Switch to 24-hour" if not use_24h else "Switch to 12-hour")
+
+fmt_btn = Button(window, text="Switch to 12-hour", command=toggle_format)
+fmt_btn.pack(pady=(0, 8))
+window.bind("<f>", toggle_format)  # press 'f' to toggle
+
+
+
 def update_label():
-    current_time = strftime("%H: %M: %S\n %d-%m-%Y ")
-    clock_label.configure(text=current_time)
-    clock_label.after(80, update_label)
-    clock_label.pack(anchor="center")
+    
+    if use_24h:
+        time_text = strftime("%H:%M:%S")
+    else:
+        # strip leading zero in 12h mode for a cleaner look
+        time_text = strftime("%I:%M:%S %p").lstrip("0")
+    clock_label.configure(text=time_text)
+    date_label.configure(text=strftime("%A, %b %d, %Y"))
+    window.after(1000, update_label)
 
 update_label()
-window.mainloop()
\ No newline at end of file
+window.mainloop()
+
+
diff --git a/Geographic Distance/geographic_distance.py b/Geographic Distance/geographic_distance.py
index bf6a0e2..c91889e 100644
--- a/Geographic Distance/geographic_distance.py	
+++ b/Geographic Distance/geographic_distance.py	
@@ -17,6 +17,32 @@ def calculate_distance_and_time(coord1, coord2, avg_speed):
 
     return distance, travel_time
 
+    def validate_coordinates(coord):
+    """Ensure latitude and longitude are within valid ranges."""
+    lat, lon = coord
+    if not (-90 <= lat <= 90):
+        raise ValueError(f"Latitude {lat} out of range (-90..90)")
+    if not (-180 <= lon <= 180):
+        raise ValueError(f"Longitude {lon} out of range (-180..180)")
+    return coord
+
+    def km_to_miles(km: float) -> float:
+    """Convert kilometers to miles."""
+    return km * 0.621371
+
+    def format_travel_time(hours: float) -> str:
+    """Format fractional hours as 'Hh Mm'."""
+    h = int(hours)
+    m = int(round((hours - h) * 60))
+    if m == 60:
+        h += 1
+        m = 0
+    return f"{h}h {m}m"
+
+
+
+    
+
 
 def main():
     # Coordinates (latitude, longitude)