# OSLogInt32ExtendedFormat.secondsSince1970 A format that displays a 32-bit integer as a date. ``` case secondsSince1970 ``` ## Discussion Use this option to format the interpolated value as a date and time, such as `2007-01-09 09:41:00`. The formatter considers the value you provide as a duration, in seconds, and adds it to the UNIX epoch to calculate the date it displays. The UNIX epoch is a method of describing a specific point in time using the elapsed number of seconds since 00:00:00 UTC January 1, 1970. The following example applies the `secondsSince1970` formatter to the 32-bit integer value `604_800`, which is the exact number of seconds in one week: ```swift // Create a logger with the specified subsystem and category. let logger = Logger(subsystem: "com.example.OSLogValueFormatting", category: "Formatter Output") // Assign the value to interpolate. In this case, the number of // seconds in an entire week. let value: Int32 = 604_800 // Write the value to the log using the specified format. logger.info(".secondsSince1970 output is \(value, format: .secondsSince1970)") ``` And the system writes the following message to the log: ``` [Formatter Output] .secondsSince1970 output is 1970-01-08 00:00:00 ``` --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)