diff --git a/extra-task-1.cpp b/extra-task-1.cpp
index 6c8c1612..efe02d97 100644
--- a/extra-task-1.cpp
+++ b/extra-task-1.cpp
@@ -1,7 +1,8 @@
+#include "extra-task-1.h"
 double seconds_difference(double time_1, double time_2)
 {
     // your implementation goes here...
-    
+    return time_2 - time_1;
     /*    
         Return the number of seconds later that a time in seconds
         time_2 is than a time in seconds time_1.
@@ -22,6 +23,7 @@ double seconds_difference(double time_1, double time_2)
 
 double hours_difference(double time_1, double time_2)
 {
+    return (time_2 - time_1) / 3600;
     /*
         Return the number of hours later that a time in seconds
         time_2 is than a time in seconds time_1.
@@ -42,6 +44,7 @@ double hours_difference(double time_1, double time_2)
 
 double to_float_hours(int hours, int minutes, int seconds)
 {
+    return hours + minutes / 60.0 + seconds / 3600.0;
     /*
         Return the total number of hours in the specified number
         of hours, minutes, and seconds.
@@ -61,6 +64,8 @@ double to_float_hours(int hours, int minutes, int seconds)
 
 double to_24_hour_clock(double hours)
 {
+    while (hours >= 24) hours -= 24;
+    return hours;
     /*
         hours is a number of hours since midnight. Return the
         hour as seen on a 24-hour clock.
@@ -108,9 +113,21 @@ double to_24_hour_clock(double hours)
     In other words, if 3800 seconds have elapsed since midnight, 
     it is currently 01:03:20 (hh:mm:ss).
 */
-
+int get_hours(int seconds) {
+    return seconds / 3600;
+ }
+int get_minutes(int seconds) {
+    return seconds % 3600 / 60;
+}
+int get_seconds(int seconds) {
+    return seconds % 60;
+}
 double time_to_utc(int utc_offset, double time)
 {
+    double a = time - utc_offset;
+    while (a >= 24) a -= 24;
+    while (a <= 0) a += 24;
+    return a;
     /*
         Return time at UTC+0, where utc_offset is the number of hours away from
         UTC+0.
@@ -139,6 +156,11 @@ double time_to_utc(int utc_offset, double time)
 
 double time_from_utc(int utc_offset, double time)
 {
+    double a = time + utc_offset;
+    while (a >= 24) a -= 24;
+    while (a <= 0) a += 24;
+    return a;
+
     /*
         Return UTC time in time zone utc_offset.
 
diff --git a/extra-task-1.h b/extra-task-1.h
new file mode 100644
index 00000000..b4bd51a6
--- /dev/null
+++ b/extra-task-1.h
@@ -0,0 +1,19 @@
+#pragma once
+#include <iostream>
+double seconds_difference(double time_1, double time_2);
+
+double hours_difference(double time_1, double time_2);
+
+double to_float_hours(int hours, int minutes, int seconds);
+
+double to_24_hour_clock(double hours);
+
+int get_hours(int seconds);
+
+int get_minutes(int seconds);
+
+int get_seconds(int seconds);
+
+double time_to_utc(int utc_offset, double time);
+
+double time_from_utc(int utc_offset, double time);
diff --git a/main.cpp b/main.cpp
new file mode 100644
index 00000000..571479cf
--- /dev/null
+++ b/main.cpp
@@ -0,0 +1,32 @@
+#include "assert.h"
+#include "extra-task-1.h"
+int main() {
+	//проверка поиска разницы секунд
+	assert(seconds_difference(1000.5,300.3) == -700.2);
+	assert(seconds_difference(300.5, 500) == 199.5);
+	//проверка поиска разницы часов
+	assert(hours_difference(1800.0, 3600.0) == 0.5);
+	assert(hours_difference(3600.0, 1800.0) == -0.5);
+	//перевод секунд, минут и часов в часы
+	assert(to_float_hours(0, 15, 0) == 0.25);
+	assert(to_float_hours(2, 45, 9) == 2.7525);
+	//перевод в часы в течение дня 
+	assert(to_24_hour_clock(24) == 0);
+	assert(to_24_hour_clock(25) == 1);
+	assert(to_24_hour_clock(28.5) == 4.5);
+	//поиск количества часов в секундах 
+	assert(get_hours(3800) == 1);
+	assert(get_hours(9000) == 2);
+	//поиск количества минут после вычета часов в секундах 
+	assert(get_minutes(3800) == 3);
+	assert(get_minutes(9000) == 30);
+	//поиск количества секунд после вычета часов и минут в секундах 
+	assert(get_seconds(3800) == 20);
+	assert(get_seconds(9000) == 0);
+	//Перевод в всемирное координированное время
+	assert(time_to_utc(+1, 12.3) == 11.3);
+	assert(time_to_utc(-11, 18.5) == 5.5);
+	//Перевод из всемирное координированное время
+	assert(time_from_utc(-7, 6.7) == 23.7);
+	assert(time_from_utc(-1, 23.82) == 22.82);
+}
\ No newline at end of file