diff --git a/model/birthdays.go b/model/birthdays.go
index c18b3f2..c1bd058 100644
--- a/model/birthdays.go
+++ b/model/birthdays.go
@@ -51,3 +51,45 @@ func NewBirthdayFromRecord(record []string) (*Birthday, error) {
 
 	return b, nil
 }
+
+func FilterByYear(birthdays []*Birthday, year int) []*Birthday {
+	filteredBirthdays := []*Birthday{}
+	for _, birthday := range birthdays {
+		if birthday.YearOfBirth == year {
+			filteredBirthdays = append(filteredBirthdays, birthday)
+		}
+	}
+	return filteredBirthdays
+}
+
+func FilterByMonth(birthdays []*Birthday, month int) []*Birthday {
+	filteredBirthdays := []*Birthday{}
+	for _, birthday := range birthdays {
+		if birthday.MonthOfBirth == month {
+			filteredBirthdays = append(filteredBirthdays, birthday)
+		}
+	}
+	return filteredBirthdays
+}
+
+func FilterByDay(birthdays []*Birthday, day int) []*Birthday {
+	filteredBirthdays := []*Birthday{}
+	for _, birthday := range birthdays {
+		if birthday.DayOfBirth == day {
+			filteredBirthdays = append(filteredBirthdays, birthday)
+		}
+	}
+	return filteredBirthdays
+}
+
+func FilterByDate(birthdays []*Birthday, day, month, year int) []*Birthday {
+	filteredBirthdays := []*Birthday{}
+	for _, birthday := range birthdays {
+		if birthday.DayOfBirth == day &&
+			birthday.MonthOfBirth == month &&
+			birthday.YearOfBirth == year {
+			filteredBirthdays = append(filteredBirthdays, birthday)
+		}
+	}
+	return filteredBirthdays
+}