How to convert Unix timestamp to Datetime in F#

🎈 🎈 🎈


    open System

    // Convert Unix timestamp to DateTime
    let unixTimestamp = 913875349L
    let dateTime = DateTimeOffset.FromUnixTimeSeconds(unixTimestamp).DateTime
    
    printfn "Converted Date: %A" dateTime

Output:

Converted Date: 1998-12-17 06:15:49

Example only. There may be multiple ways to perform this operation.

Code Explanation

In this F# example, the Unix timestamp '913875349' is converted to a DateTime object using the DateTimeOffset.FromUnixTimeSeconds() method.
The result is the date '1998-12-17 06:15:49'. The .DateTime property extracts the DateTime value from the DateTimeOffset object, and printfn is used to display the converted date in the console.

Convert Date to Unix timestamp in F#

Other useful F# date functions

Function	Description	Example
`DateTime.Now`	Returns the current local date and time as a `DateTime` object.	`DateTime.Now` returns 2024-08-28 12:34:56
`DateTime.UtcNow`	Returns the current UTC date and time as a `DateTime` object.	`DateTime.UtcNow` returns 2024-08-28 16:34:56
`DateTimeOffset.FromUnixTimeSeconds()`	Converts a Unix timestamp (in seconds) to a `DateTimeOffset` object.	`DateTimeOffset.FromUnixTimeSeconds(1652602245L)` returns 2022-05-15 08:10:45 UTC
`DateTimeOffset.ToUnixTimeSeconds()`	Converts a `DateTimeOffset` object to a Unix timestamp in seconds.	`dateTimeOffset.ToUnixTimeSeconds()` returns 1652602245
`DateTime.Add()`	Adds a specified time interval to a `DateTime` object.	`DateTime.Now.Add(TimeSpan.FromDays(5.0))` adds 5 days to the current date.
`DateTime.Subtract()`	Subtracts a specified time interval from a `DateTime` object.	`DateTime.Now.Subtract(TimeSpan.FromHours(3.0))` subtracts 3 hours from the current time.
`DateTime.Parse()`	Parses a string representation of a date and time into a `DateTime` object.	`DateTime.Parse("2024-08-28T12:34:56")` returns 2024-08-28 12:34:56
`TimeSpan.FromDays()`	Creates a `TimeSpan` object representing a specified number of days.	`TimeSpan.FromDays(7.0)` returns a time span of 7 days.
`DateTime.ToString()`	Formats a `DateTime` object as a string.	`dateTime.ToString("yyyy-MM-dd HH:mm:ss")` returns 2024-08-28 12:34:56
`DateTime.Compare()`	Compares two `DateTime` objects and returns an integer indicating if the first is earlier, the same, or later than the second.	`DateTime.Compare(date1, date2)` returns -1, 0, or 1

Current Unix Timestamp SECONDS SINCE JAN 01 1970

Current UTC Time

2025-08-20