diff --git a/java_datastamp2date/datetime.java b/java_datastamp2date/datetime.java
index 512b5b5..d521e13 100644
--- a/java_datastamp2date/datetime.java
+++ b/java_datastamp2date/datetime.java
@@ -1,35 +1,5 @@
 package datetime;
 
-class DaysOfYear {
-	int year;
-	int days;
-	
-	public DaysOfYear(int year, int days) {
-		this.year = year;
-		this.days = days;
-	}
-}
-
-class DaysOf4Year {
-	int firstYear;
-	DaysOfYear[] doy;
-	
-	void setYearAfter2000(boolean after2k) {
-		this.doy = new DaysOfYear[4];
-		this.doy[0] = new DaysOfYear(4, 1461);
-		this.doy[1] = new DaysOfYear(3, 1096);
-		if (after2k) {
-			this.firstYear = 2000;
-			this.doy[1] = new DaysOfYear(2, 731);
-			this.doy[1] = new DaysOfYear(1, 366);
-		} else {
-			this.firstYear = 1970;
-			this.doy[1] = new DaysOfYear(2, 730);
-			this.doy[1] = new DaysOfYear(1, 365);
-		}
-	}
-}
-
 class Datetime {
 	int year;
 	int month;