LanguageValues and typesStandard typesTime and calendar
YearMonth
On this page
One month of one year: 2026-10.
Use it for a billing period or a monthly report. For the month a card expires, use CardExpiry. For a month in any year, use Month.
Shape
| Field | Type | Required? |
|---|---|---|
year |
Int |
Yes |
month |
Int |
Yes |
Example
YearMonth { year: 2026 month: 10 }text.parse(raw, as: YearMonth) reads one from text that comes from outside. Text that isn't one at all fails malformed, such as 2026-13, 2026-00 or 2026-1.
Good to know
==tells you whether two are the same, and<andlist.sort_bycompare and sort them.
In JSON
A string, in a request, a response or json.write:
"2026-02""2026-10"
Details
Text form, storage, how it is shown, and operations
YearMonth 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: 2026-02 and 2026-10.
How it is stored
It is stored in 2 columns, each named for the field, _ and its suffix. This is 2026-10:
| Column | Type | Holds |
|---|---|---|
<field>_year |
smallint |
2026 |
<field>_month |
smallint |
10 |
How it is shown to people
text.format(value, locale:) shows it to people in their locale.
With locale: Locale.en_gb:
| Value | Shown |
|---|---|
2026-02 |
February 2026 |
2026-10 |
October 2026 |
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-year-month.md.Built from Jadpo main at aee2e8f.