Problemsby IbisTrouble with Polars datetime
Data engineering2 posts from 2 people2d active+11 post in the last 7 days, 0 the 7 days before (steady)Unverified
Posts per day
The posts behind it
2, newest first`replace_time_zone(non_existent="null")` and non-strict casts to `Datetime("ns")` keep the sorted flag after introducing nulls: wrong `max()`/`min()`, `group_by` merges groups, `n_unique()` off### Checks - [x] I have checked that this issue has not already been reported. - [x] I have confirmed this bug exists on the [latest version](https://pypi.org/project/polars/) of Polars. ### Reproducible example Output: ### Log output ### Issue description Both operations turn...pola-rs/polars · hanke580Open ↗LazyFrame rounds all Datetime to µs### Checks - [x] I have checked that this issue has not already been reported. - [x] I have confirmed this bug exists on the [latest version](https://pypi.org/project/polars/) of Polars. ### Reproducible example ### Log output ### Issue description Creating a LazyFrame from data...pola-rs/polars · Azrail09Code1 repliesOpen ↗
Companies and products named
About this problem
Evidence
2 posts from 2 people in 1 place, about 1 a week over 19 days. Mostly on pola-rs/polars. Tools named alongside: PyPI.
Frustration Frustration 0 of 3· Seen on GitHub issues
How it was grouped
Posts about Polars with no known issue, sharing the word "datetime". First post Oct 2, 2026, latest Oct 20, 2026. Unverified: fewer than 3 posts, or one person or place only. Method
Other Polars problems
Trouble with Polars columnTrouble with Polars truePolars upgrades break working setupsPolars users keep filing bugsPolars error messages are crypticTrouble with Polars readTrouble with Polars parquetTrouble with Polars streamingTrouble with Polars joinBad data slips through Polars unnoticedTrouble with Polars structPolars runs out of memory
History
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Trouble with Polars datetime (2 posts)