LocalDateTime

On this page

Shape
Example
Good to know
In JSON
Details

A date and a clock time with no zone: 2026-10-25T09:30:00.

Use it for a future appointment, where the clock time must hold even if a country changes its daylight saving rules. It isn't one moment until you give it a zone. For a moment, use Instant.

Shape

Field	Type	Required?
`date`	`CalendarDate`	Yes
`time`	`LocalTime`	Yes

Example

example

LocalDateTime { date: "2026-10-25" time: LocalTime { hour: 9 minute: 30 second: 0 } }

text.parse(raw, as: LocalDateTime) reads one from text that comes from outside. Text that isn't one at all fails malformed, such as 2026-10-25T01:30:00Z, 2026-10-25 01:30:00 or 2026-10-25T24:00:00.

Good to know

temporal.resolve turns one into an instant in a Zone.
== tells you whether two are the same, and < and list.sort_by compare and sort them.

In JSON

A string, in a request, a response or json.write:

json

"2026-03-29T01:30:00""2026-10-25T01:30:00"

Details

Text form, storage, how it is shown, and operations

LocalDateTime is in the group Time and calendar, and has been in Jadpo since 0.1.0.

Text form

text.from writes one standard text form, the same form text.parse reads back: 2026-03-29T01:30:00 and 2026-10-25T01:30:00.

How it is stored

It is stored in one column named for the field, of type timestamp. 2026-10-25T01:30:00 is stored as '2026-10-25 01:30:00.000000'::timestamp.

How it is shown to people

text.format(value, locale:) shows it to people in their locale. A call also gives format:.

With locale: Locale.en_gb and format: TimeFormat.date_time_medium:

Value	Shown
`2026-03-29T01:30:00`	`29 Mar 2026, 01:30:00`
`2026-10-25T01:30:00`	`25 Oct 2026, 01:30:00`

Operations

It also takes text.parse, text.from, text.format, json.read, json.write and ==. How every standard type behaves says how they work.

Markdown for agents: /docs/types/type-local-date-time.md.Built from Jadpo main at aee2e8f.