diff --git a/src/task_1/index.js b/src/task_1/index.js
index 2abfd00..53a3dc4 100644
--- a/src/task_1/index.js
+++ b/src/task_1/index.js
@@ -15,6 +15,31 @@
 @param {number} hours - Час
 @param {number} minutes - Минуты
  */
-function Time(hours, minutes) { };
+function Time(hours, minutes) {
+	if (hours >= 24 || minutes >= 60 || hours < 0 || minutes < 0) throw new Error();
+	this.hours = hours;
+	this.minutes = minutes;
+ };
 
+Time.prototype.isEarlier = function(time){
+	if(time.hours > this.hours)
+		return true;
+	else
+	{
+		if (time.minutes > this.minutes)
+		return true;
+		else return false;
+	}
+};
+
+Time.prototype.isLater = function(time){
+	if(time.hours < this.hours)
+		return true;
+	else
+	{
+		if (time.minutes < this.minutes)
+		return true;
+		else return false;
+	}
+};
 module.exports.Time = Time;
diff --git a/src/task_2/index.js b/src/task_2/index.js
index f20d7ee..07fac1a 100644
--- a/src/task_2/index.js
+++ b/src/task_2/index.js
@@ -17,6 +17,56 @@ const { Time } = require('../task_1/index');
 @param {Time} startTime - Время начала встречи
 @param {Time} endTime - Время конца встречи
  */
-function Meeting(meetingDate, startTime, endTime) { };
+function Meeting(meetingDate, startTime, endTime) {
+	if (startTime.hours > endTime.hours)
+	{
+		throw new Error();
+	}
+	else 
+	{
+		if (startTime.minutes > endTime.minutes && startTime.hours === endTime.hours)
+		{
+			throw new Error();
+		}
+	}
+	this.startTime = startTime;
+	this.meetingDate = meetingDate;
+	this.endTime = endTime;
+ };
+
+Meeting.prototype.isMeetingInTimeRange = function(start, end){
+	if (this.startTime.hours === start.hours)
+	{
+		if (this.endTime.hours < end.hours)
+		{
+			 return true;
+		}
+		else
+		{
+			if (end.minutes < this.startTime.minutes)
+			{
+				return false;
+			}
+			else 
+			{
+				return true;
+			}
+		}
+	}
+	else
+	{
+		if (end.hours < this.endTime.hours)
+		{ 
+			return false;
+		}
+		else 
+		{
+			if (end.minutes > this.startTime.minutes) 
+			{
+				return true;
+			}
+		}
+	}
+};
 
 module.exports.Meeting = Meeting;
diff --git a/src/task_3/index.js b/src/task_3/index.js
index 4212ffa..26c0036 100644
--- a/src/task_3/index.js
+++ b/src/task_3/index.js
@@ -11,6 +11,18 @@
 @param {Date} vacationEndDate - Время конца отпуска
  */
 
-function Vacation(vacationStartDate, vacationEndDate) { };
+function Vacation(vacationStartDate, vacationEndDate) {
+	if (vacationStartDate > vacationEndDate || 
+		(vacationStartDate.getDate() === vacationEndDate.getDate())) throw new Error();
+	this.vacationStartDate = vacationStartDate;
+	this.vacationEndDate = vacationEndDate;
+ };
+
+ Vacation.prototype.isDateInVacation = function(date){
+	if (this.vacationStartDate.getDate() <= date.getDate() && this.vacationEndDate.getDate() >= date.getDate() && 
+	date.getFullYear() === this.vacationStartDate.getFullYear())
+	 	return true;
+	else return false;
+ };
 
 module.exports.Vacation = Vacation;
diff --git a/src/task_4/index.js b/src/task_4/index.js
index cae825a..0d4d666 100644
--- a/src/task_4/index.js
+++ b/src/task_4/index.js
@@ -12,6 +12,9 @@ const { Vacation } = require('../task_3/index');
 @param {Array<Vacation>} vacations - Массив отпусков
  */
 
-function Organaizer(meetings, vacations) { };
+function Organaizer(meetings, vacations) {
+	this.meetings = meetings;
+	this.vacations = vacations;
+ };
 
 module.exports.Organaizer = Organaizer;
diff --git a/src/task_5/index.js b/src/task_5/index.js
index c49a642..490fb68 100644
--- a/src/task_5/index.js
+++ b/src/task_5/index.js
@@ -14,5 +14,18 @@ const { Organaizer } = require('../task_4/index');
 		Отпуск не попадает в промежуток другого отпуска
 		В промежуток отпуска не назначено никаких встреч
  */
+Organaizer.prototype.addMeeting = function(meeting){
+	this.vacations.forEach(element => {
+		if (element.isDateInVacation(meeting["meetingDate"]))
+			return false;
+	});
+	this.meetings.forEach(element => {
+		if (element.isMeetingInTimeRange(meeting["startTime"], meeting["endTime"]) &&
+		element.meetingDate.getDate() == meeting.meetingDate.getDate())
+			return false;
+	});
+	this.meetings.push(meeting);
+	return true;
+};
 
 module.exports.Organaizer = Organaizer;