How to convert Datetime to Unix timestamp in F#

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    open System

    // Convert DateTime to Unix timestamp
    let dateTime = DateTime(2022, 5, 15, 8, 30, 45, DateTimeKind.Utc)
    let unixTimestamp = DateTimeOffset(dateTime).ToUnixTimeSeconds()
    
    printfn "Unix Timestamp: %A" unixTimestamp

Output:

Unix Timestamp: 1652603445

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

Code Explanation

In this F# example, a DateTime object is created for '2022-05-15 08:30:45' in UTC using the DateTime constructor.
The DateTimeOffset wrapper is used to access the ToUnixTimeSeconds() method, which converts the DateTime object into the corresponding Unix timestamp (1652603445).
The result is printed using printfn
.

Convert Unix timestamp to Date 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