diff --git a/Testat-Planer.zig b/Testat-Planer.zig
index 6861dac..a05f54a 100644
--- a/Testat-Planer.zig
+++ b/Testat-Planer.zig
@@ -1,5 +1,6 @@
 const std = @import("std");
-const writer = std.io.getStdOut().writer();
+const writer = std.io.getStdOut().writer(); //rausnehmen
+
 
 const Timestamp = struct {
     hours: u64,
@@ -23,6 +24,7 @@ const pause_minutes: u64 = 2;                   // Länge der Pause zwischen 2 T
 
 
 pub fn main () !void {
+
     var testStamp = Timestamp {
         .hours = 13,
         .minutes = 5,
@@ -33,14 +35,35 @@ pub fn main () !void {
     try printTimestamp(&testStamp);
     try writer.print("\n", .{});
     try printPlan();
+
+    try addMinutesToTimestamp(&testStamp, 175);
+    try printTimestamp(&testStamp);
 }
 
 // Printet timestamp im Format HH:MM
 pub fn printTimestamp(ts: *Timestamp) !void {
-try writer.print("{0d:0>2}:{1d:0>2}", .{ ts.hours, ts.minutes });
+
+    try writer.print("{0d:0>2}:{1d:0>2}", .{ ts.hours, ts.minutes });
+}
+
+pub fn addMinutesToTimestamp(ts: *Timestamp, min: u16) !void{
+
+    var addHours: u64 = min / 60;
+    var addMinutes: u64 = min%60;
+
+
+    if ((addMinutes + ts.minutes) >= 60){
+        addMinutes = (addMinutes + ts.minutes)%60;
+        addHours += 1;
+    }
+
+    ts.hours += addHours;
+    ts.hours += addMinutes;
+
 }
 
 pub fn printPlan() !void {
+
     const rand = std.crypto.random;
     
     const noneNumber:u64 = number_of_testees+1;