diff --git a/Lesson_1/task3.py b/Lesson_1/task3.py
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+++ b/Lesson_1/task3.py
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+# Lesson 1 Task 3: calculate how much time passed since Unix epoch
+# Author: Stanislav Mykhailenko
+# License: Unlicense
+
+# Return codes:
+# 0 - OK
+# 1 - Invalid Unix timestamp entered
+
+import sys
+
+try:
+	timestamp = int(input("Enter Unix timestamp: "))
+except ValueError:
+	print("Invalid Unix timestamp entered.")
+	sys.exit(1)
+
+# duration in seconds
+day = 86400 # 24 * hour
+hour = 3600 # 60 * minute
+minute = 60
+
+days = int(timestamp / day)
+hours = int(int(timestamp % day) / hour)
+minutes = int(int(int(timestamp % day) % hour) / minute)
+seconds = int(int(timestamp % day) % hour) % minute
+
+print(str(days) + ":" + str(hours) + ":" + str(minutes) + ":" + str(seconds))