First ever arduino digital watch without rtc module

1//change the longest, middle and shortest value according to your time  and then upload the code.
2
3#include <LiquidCrystal.h>
4LiquidCrystal lcd(12,  11, 5, 4, 3, 2);
5
6//change the longest's value to change seconds.
7int longest=0;
8
9//change  the middle's value to change minutes.
10int middle=0;
11
12//change the shortest's  value to change hours.
13int shortest=0;
14
15void setup() {
16  lcd.begin(16,  2);
17  //Time here is displayed in IST.
18  lcd.print("Time in IST -");
19}
20
21void  loop() {
22  if(longest<60){
23    delay(1000);
24    longest=longest+1;
25  }
26  else{
27    longest=00;
28  }
29  
30  if(longest>59){
31    middle=middle+1;
32  }
33  else{
34    middle=middle;
35  }
36  
37  if(middle<60){
38    middle=middle;
39    shortest=shortest;
40  }
41  else{
42    middle=0;
43    shortest=shortest+1;
44  }
45
46  if(shortest<24){
47    shortest=shortest;
48  }
49  else{
50    shortest=0;
51  }
52    
53  lcd.setCursor(0, 1);
54  lcd.print(shortest);
55  lcd.print(":");
56  lcd.print(middle);
57  lcd.print(":");
58  lcd.print(longest);
59  lcd.print("________");
60  
61}
62