Skip to content

docs: document timestamp and time zone semantics #25162

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Closed
adriangb wants to merge 4 commits into from
+775 −6
Closed

docs: document timestamp and time zone semantics #25162

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
4 commits
Select commit Hold shift + click to select a range
e2b397e
docs: document timestamp and time zone semantics
adriangb Sep 10, 2026
e7049e4
docs: rewrite timestamps page prose in Simplified Technical English
adriangb Sep 10, 2026
e0522fa
docs: use one timestamp vocabulary across the whole timestamps page
adriangb Sep 10, 2026
e40156d
docs: warn that the to_local_time round trip stops erroring across DST
adriangb Sep 10, 2026
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
21 changes: 15 additions & 6 deletions docs/source/user-guide/sql/data_types.md
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -105,12 +105,21 @@ The maximum supported precision for `DECIMAL` types is 76.

## Date/Time Types

| SQL DataType | Arrow DataType |
| ------------ | :------------------------------- |
| `DATE` | `Date32` |
| `TIME` | `Time64(Nanosecond)` |
| `TIMESTAMP` | `Timestamp(Nanosecond, None)` |
| `INTERVAL` | `Interval(IntervalMonthDayNano)` |
| SQL DataType | Arrow DataType |
| ------------------------------------------- | :------------------------------------------------------------ |
| `DATE` | `Date32` |
| `TIME` | `Time64(Nanosecond)` |
| `TIMESTAMP` | `Timestamp(Nanosecond, None)` |
| `TIMESTAMP WITH TIME ZONE` or `TIMESTAMPTZ` | `Timestamp(Nanosecond, Some(datafusion.execution.time_zone))` |
| `INTERVAL` | `Interval(IntervalMonthDayNano)` |

`TIMESTAMP(p)` and `TIMESTAMP(p) WITH TIME ZONE` accept a precision `p` of 0, 3,
6 or 9, selecting second, millisecond, microsecond or nanosecond precision.

Note that `datafusion.execution.time_zone` defaults to unset, in which case
`TIMESTAMP WITH TIME ZONE` maps to the timezone-**naive**
`Timestamp(Nanosecond, None)`. See [Timestamps and Time Zones](timestamps.md)
for what that means for casts, comparisons and the date/time functions.

## Boolean Types

Expand Down
1 change: 1 addition & 0 deletions docs/source/user-guide/sql/index.rst
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -22,6 +22,7 @@ SQL Reference
:maxdepth: 2

data_types
timestamps
struct_coercion
select
subqueries
Expand Down
Loading
Loading