New version (0.3.48) makes my project stop compiling

[nicopap]

Edit from @jhpratt:

Do not make "me too" comments. They add nothing of value and will only mean it takes longer for me to release a patch, as it's more I have to read. I am aware of the issue and the downstream breakage. A patch will be issued as soon as I am able.

Original issue follows.

---

Since updating the time crate from 0.3.47 to 0.3.48, my crate stop compiling with the following error message:

error[E0119]: conflicting implementations of trait `From<format_description::parse::format_item::HourBase>` for type `<format_description::parse::format_item::HourBase as format_description::parse::format_item::ModifierValue>::Type`
   --> .../tracing-subscriber-0.3.23/src/filter/env/mod.rs:759:1
    |
759 | / impl<S> From<S> for EnvFilter
760 | | where
761 | |     S: AsRef<str>,
    | |__________________^
    |
    = note: conflicting implementation in crate `time`:
            - impl From<format_description::parse::format_item::HourBase> for <format_description::parse::format_item::HourBase as format_description::parse::format_item::ModifierValue>::Type;
    = note: upstream crates may add a new impl of trait `core::convert::AsRef<str>` for type `time::format_description::parse::format_item::HourBase` in future versions

Not sure if it is the time crate responsibility or tracing_subscriber 🙈

I'm not sure what's going on. HourBase is a private type. May be a compiler bug?

Tested with cargo v1.90.0, nightly 1.98.0 (2026-06-11) and nightly 1.96.0 ( 2026-03-19)

Workaround

As mentioned in the thread, in your Cargo.toml, pin the time dependency:

-time = "0.3.47"
+time = "=0.3.47"

If time is a transitive dependency, then add the + line to your Cargo.toml. It's recommended to revert to unpinned dependency once the fix is in.

Please don't do this if your crate is a library upon which 3rd parties rely (🙏). It will likely result in duplicate time deps, and further compilation issues caused by incompatible same-crate types.

[AntoineSebert]

Same issue with different toolchain:

rustup --version
rustup 1.29.0 (28d1352db 2026-03-05)
info: This is the version for the rustup toolchain manager, not the rustc compiler.
info: the currently active `rustc` version is `rustc 1.96.0 (ac68faa20 2026-05-25)`

Workaround:

cargo update -p time --precise 0.3.47

[krisztianfekete]

We are also affected by this.

[yossy4411]

I'm also experiencing the same issue now

[alienscience]

Just to add another data point. With rust 1.96, we get a clash with the cookie crate:

error[E0119]: conflicting implementations of trait `From<format_description::parse::format_item::HourBase>` for type `<format_description::parse::format_item::HourBase as format_description::parse::form
at_item::ModifierValue>::Type`                                                                                                                                                                            
   --> /home/saul/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/cookie-0.16.2/src/expiration.rs:130:1                                                                                              
    |                                                                                                                                                                                                     
130 | impl<T: Into<Option<OffsetDateTime>>> From<T> for Expiration {                                                                                                                                      
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^                                   
    |                                                                                                                                                                                                     
    = note: conflicting implementation in crate `time`:
            - impl From<format_description::parse::format_item::HourBase> for <format_description::parse::format_item::HourBase as format_description::parse::format_item::ModifierValue>::Type;
    = note: upstream crates may add a new impl of trait `std::convert::Into<std::option::Option<time::OffsetDateTime>>` for type `time::format_description::parse::format_item::HourBase` in future versio
ns

For more information about this error, try `rustc --explain E0119`.

And the aws-smithy-types crate:

error[E0119]: conflicting implementations of trait `From<format_description::parse::format_item::HourBase>` for type `<format_description::parse::format_item::HourBase as format_description::parse::form
at_item::ModifierValue>::Type`                                                                                                                                                                            
  --> /home/saul/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/aws-smithy-types-1.4.9/src/timeout.rs:49:1                                                                                          
   |                                                                                                 
49 | impl<T> From<T> for CanDisable<T> {                                                                                                                                                                  
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^                                                               
   |                                                                                                 
   = note: conflicting implementation in crate `time`:                                               
           - impl From<format_description::parse::format_item::HourBase> for <format_description::parse::format_item::HourBase as format_description::parse::format_item::ModifierValue>::Type;           
                                                                                                                                                                                                          
For more information about this error, try `rustc --explain E0119`. 

[tliron]

Is there a temporary fix?

As far as I can tell, it's impossible to pin versions of indirect dependencies using Cargo.

[paolobarbolini]

As far as I can tell, it's impossible to pin versions of indirect dependencies using Cargo.

Temporarily make it into a direct dependency and then you'll be able to pin it.

[neunzehn86]

Is there a temporary fix?

As far as I can tell, it's impossible to pin versions of indirect dependencies using Cargo.

Pin the version with:

cargo update -p time --precise 0.3.47

But be careful with simple cargo update, I'll be the latest again.

[xlfish233]

check my pr https://github.com/time-rs/time/pull/784 i had fixed this.

[yeoleobun]

I have same problem

sqlx-core = 0.8.6 will conflict with time = 0.3.48

[jperkin]

Also breaks ratatui-widgets:

error[E0119]: conflicting implementations of trait `From<format_description::parse::format_item::HourBase>` for type `<format_description::parse::format_item::HourBase as format_description::parse::format_item::ModifierValue>::Type`
   --> /root/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/ratatui-widgets-0.3.1/src/list/item.rs:210:1
    |
210 | / impl<'a, T> From<T> for ListItem<'a>
211 | | where
212 | |     T: Into<Text<'a>>,
    | |______________________^
    |
    = note: conflicting implementation in crate `time`:
            - impl From<format_description::parse::format_item::HourBase> for <format_description::parse::format_item::HourBase as format_description::parse::format_item::ModifierValue>::Type;
    = note: upstream crates may add a new impl of trait `core::convert::Into<ratatui_core::text::Text<'_>>` for type `time::format_description::parse::format_item::HourBase` in future versions

error[E0119]: conflicting implementations of trait `From<format_description::parse::format_item::HourBase>` for type `<format_description::parse::format_item::HourBase as format_description::parse::format_item::ModifierValue>::Type`
   --> /root/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/ratatui-widgets-0.3.1/src/table/cell.rs:185:1
    |
185 | / impl<'a, T> From<T> for Cell<'a>
186 | | where
187 | |     T: Into<Text<'a>>,
    | |______________________^
    |
    = note: conflicting implementation in crate `time`:
            - impl From<format_description::parse::format_item::HourBase> for <format_description::parse::format_item::HourBase as format_description::parse::format_item::ModifierValue>::Type;
    = note: upstream crates may add a new impl of trait `core::convert::Into<ratatui_core::text::Text<'_>>` for type `time::format_description::parse::format_item::HourBase` in future versions