update

Time-Stamp/src/com/task1/StringValidity.java

 package com.task1;
+
 import java.util.Scanner;
+
 public class StringValidity {
 
 	public static void main(String[] args) {
@@ -7,22 +9,21 @@ public class StringValidity {
 		Scanner sc = new Scanner(System.in);
 		System.out.print("Enter A Name .. ");
 		String name = sc.nextLine();
-		boolean isValid=true;
-		for(int i =0; i<name.length(); i++) {
+		boolean isValid = true;
+		for (int i = 0; i < name.length(); i++) {
 
 			char ch = name.charAt(i);
 
-			if(ch >='a' && ch<='z' || ch>='A' && ch<='Z') {
-				continue ;
+			if (ch >= 'a' && ch <= 'z' || ch >= 'A' && ch <= 'Z') {
+				continue;
 			}
 			isValid = false;
 		}
 
-		if(isValid) {
-			System.out.println("\nThe Name "+ name + " is a Valid Name.");
-		}
-		else {
-			System.out.println("\nThe Name "+ name + " is a Invalid Name.");
+		if (isValid) {
+			System.out.println("\nThe Name " + name + " is a Valid Name.");
+		} else {
+			System.out.println("\nThe Name " + name + " is a Invalid Name.");
 		}
 
 	}

Time-Stamp/src/com/task3/CheckLeapYearOrNot.java

 package com.task3;
+
 import java.util.Scanner;
 
 public class CheckLeapYearOrNot {
@@ -9,10 +10,9 @@ public class CheckLeapYearOrNot {
 		System.out.print("Enter Year... ");
 		int year = sc.nextInt();
 
-	 if((year%400==0)|| (year%4==0 && year%100!=0)) {
-		 System.out.println("\n"+ year + " is a Leap Year");
-	 }
-	 else {
+		if ((year % 400 == 0) || (year % 4 == 0 && year % 100 != 0)) {
+			System.out.println("\n" + year + " is a Leap Year");
+		} else {
 			System.out.println("\n" + year + " is Not a leap year");
 		}
 

Time-Stamp/src/com/task4/DateFormates.java

 package com.task4;
+
 import java.text.ParseException;
+
 import java.text.SimpleDateFormat;
 import java.time.LocalDate;
 import java.util.Calendar;
@@ -10,30 +12,22 @@ public class DateFormates {
 	public static void main(String[] args) {
 
 		Calendar cal = Calendar.getInstance(); 
-		//System.out.println("Date: " + (cal.get(Calendar.MONTH)+1)+ "-" + (cal.get(Calendar.DATE)) + " Time : "+cal.get(Calendar.HOUR) + ":" + cal.get(Calendar.MINUTE)  
-//	    + ":" + cal.get(Calendar.SECOND)  + "-" + (cal.get(Calendar.YEAR)) );  
 		System.out.println("Current Date  : " + cal.getTime());
 
-		   cal.add (Calendar.MONTH, 1);
+		cal.add(Calendar.MONTH, 1);
 
 		System.out.println("After Add One Month in Current Date  : " + cal.getTime());
 
 		System.out.println("                  ----- First Task Done -----");
 
-		   
 		Calendar cale = Calendar.getInstance();
 		System.out.println("\nCurrent Date  : " + cale.getTime());
 		cale.add(Calendar.DATE, -15);
-			System.out.println("After Subsctract Fifteen Days From Current Date: " + (cale.get(Calendar.YEAR))+ " " + (cale.get(Calendar.MONTH)+1) + " "+cale.get(Calendar.DATE) + "  " + cale.get(Calendar.HOUR)  
-		    + ":" + cale.get(Calendar.MINUTE)  + " " + (cale.get(Calendar.SECOND)) ); 
+		System.out.println("After Subsctract Fifteen Days From Current Date: " + (cale.get(Calendar.YEAR)) + " "
+				+ (cale.get(Calendar.MONTH) + 1) + " " + cale.get(Calendar.DATE) + "  " + cale.get(Calendar.HOUR) + ":"
+				+ cale.get(Calendar.MINUTE) + " " + (cale.get(Calendar.SECOND)));
 		System.out.println("                  ----- Second Task Done -----");
 
-
-		
-		
-				
-	
-			     
 	}
 
 }

Time-Stamp/src/task2/com/FindSecondsAndMilliSeconds.java

@@ -5,8 +5,8 @@ public class FindSecondsAndMilliSeconds {
 	public static void main(String[] args) {
 		long seconds = System.currentTimeMillis() / 1000l;
 		long milli = System.currentTimeMillis();
-	     System.out.println("\nSeconds since 1970: "+seconds+"\n");
-	     System.out.println("\nMillisecondsSeconds since 1970: "+milli+"\n");
+		System.out.println("\nSeconds since 1970: " + seconds + "\n");
+		System.out.println("\nMillisecondsSeconds since 1970: " + milli + "\n");
 	}
 
 }
\ No newline at end of file