implicit conversion import error when DateTime promoted to DateTimeOffset #3908

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1. MangelMaxime commented on Sep 29, 2024

   

   MangelMaxime

   on Sep 29, 2024

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   I think we can just alias to op_Implicit to fromDate:

   // Write code or load a sample from sidebar
   open System
   
   let _: DateTimeOffset = DateTime.UtcNow.Date
   
   let x = DateTimeOffset(DateTime.UtcNow.Date)

   import { fromDate, op_Implicit } from "fable-library-js/DateOffset.js";
   import { utcNow, date } from "fable-library-js/Date.js";
   
   op_Implicit(date(utcNow()));
   
   export const x = fromDate(date(utcNow()));

   We can do it directly in the Replacement module to avoid having a new function in fable-library, I will have a look at it later.
2. github-actions

   added

   bug

   javascript

   on Mar 17, 2026
3. github-actions

   added a commit that references this issue on Mar 18, 2026

   Fix implicit DateTime→DateTimeOffset conversion emitting missing op_I…

   ...

   This issue will close once commit 79c0b67 is merged into the 'main' branch.

   79c0b67
4. github-actions commented on Mar 18, 2026

   

   github-actionsBot

   on Mar 18, 2026 – with GitHub Actions

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   🤖 This is an automated response from Repo Assist.

   I've submitted a fix for this issue. The root cause is exactly as @MangelMaxime identified: op_Implicit falls through to the catch-all handler in dateTimeOffset replacements, which generates import { op_Implicit } from "…/DateOffset.js" — but that function doesn't exist.

   Fix: Added an explicit "op_Implicit" case in src/Fable.Transforms/Replacements.fs that redirects to the existing fromDate function (the same one used by the .ctor path when a DateTime argument is passed):

   | "op_Implicit" ->
       Helper.LibCall(com, moduleName, "fromDate", t, args, i.SignatureArgTypes, ?loc = r)
       |> Some

   A draft PR has been opened with this change and a test that verifies the round-trip let dto: DateTimeOffset = d → dto.UtcDateTime = d.

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5. MangelMaxime

   closed this as completedin #4697on Jun 29, 2026