Contents

OSLogInt32ExtendedFormat.secondsSince1970

A format that displays a 32-bit integer as a date.

Declaration

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:

// 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

See Also

Getting the Formats