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TimeZoneInfo issue
f#

Hi,
I want to convert one time from my current time zone to EST, but I don't know how to write the code. Even the following basic codes didn't work.
> open System.TimeZoneInfo
let estTimeZone = TimeZoneInfo.FindSystemTimeZoneById("Eastern Standard Time")
;;

open System.TimeZoneInfo
------------^^^^^^^^^^^^

stdin(3,13): error FS0039: The namespace 'TimeZoneInfo' is not defined
>
My task is to convert the current time (now) to EST time.
Thanks!

.

This works:

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    let now = DateTime.Now.ToUniversalTime()
    let est = System.TimeZoneInfo.FindSystemTimeZoneById "Eastern Standard Time"
    let offset = est.GetUtcOffset now
    let estTime = now.AddHours offset.TotalHours

but you need to be compiling for .NET 3.5 or greater, or 

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TimeZoneInfo

won't be defined I think. And I think FSI goes to .NET 2.0 by default (at least on my machine), so that may be the source of your issues.

By on 2/22/2010 7:08 AM ()

Hi, Mau:
Thank you very much for your input.
The following code works:
> open System
let now = DateTime.Now.ToUniversalTime()
let est = System.TimeZoneInfo.FindSystemTimeZoneById "Eastern Standard Time"
let offset = est.GetUtcOffset now
let estTime = now.AddHours offset.TotalHours;;

val now : DateTime = 2/25/2010 7:18:33 PM
val est : TimeZoneInfo = (UTC-05:00) Eastern Time (US & Canada)
val offset : TimeSpan = -05:00:00
val estTime : DateTime = 2/25/2010 2:18:33 PM

I have to use open System in F# Interactive, otherwise, I got a lot of warnings.
Thank you very much for your help.

By on 2/25/2010 11:19 AM ()

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