How to Convert Date to Timestamp or Unix Time in Swift

Handling date and time in programming often involves converting between Date objects and timestamps or Unix time. Timestamps are a common way to represent time as a numeric value, making it easy to perform calculations or store temporal data. In Swift, you can easily convert a Date to a timestamp, and vice versa. In this guide, we’ll explore how to do just that.

Understanding Unix Time

Unix time, also known as POSIX time or epoch time, is the number of seconds that have elapsed since January 1, 1970, at 00:00:00 UTC (Coordinated Universal Time). It is a standardized way to represent time in many computing systems and is widely used in various applications.

Converting Date to Timestamp

In Swift, you can convert a Date object to a timestamp by using the timeIntervalSince1970 property. Here’s a simple example:

import Foundation

let currentDate = Date()
let timestamp = currentDate.timeIntervalSince1970
print("Timestamp: \(timestamp)")

In this code, we create a Date object representing the current date and time. We then use the timeIntervalSince1970 property to obtain the Unix time as a Double value.

Converting Timestamp to Date

Converting a timestamp back to a Date is just as straightforward. You can use the init(timeIntervalSince1970:) initializer of the Date class. Here’s an example:

import Foundation

let timestamp: TimeInterval = 1635500000 // Replace with your timestamp
let date = Date(timeIntervalSince1970: timestamp)
print("Date: \(date)")

In this code, we create a Date object from a given timestamp using the init(timeIntervalSince1970:) initializer.

Handling Timestamps in Your App

Timestamps are useful for a wide range of tasks, including recording events, calculating time intervals, or synchronizing data across different time zones. By converting between Date objects and timestamps, you can efficiently manage time-related operations in your Swift applications.


Converting a Date to a timestamp or Unix time and vice versa is a fundamental task in many Swift applications. With the timeIntervalSince1970 property and the init(timeIntervalSince1970:) initializer, Swift provides a straightforward way to work with timestamps. Whether you’re dealing with time-based data or need to manage events over time, mastering these conversions is a valuable skill.

Remember to handle time zones and be aware of potential issues related to date and time in your specific use case. This knowledge will help you make the most of timestamp conversions in your Swift projects.

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