`dayjs`

The Day.js rendering target. Imported from rosetta-date/libraries:


import { dayjs } from 'rosetta-date/libraries'

Base grammar: moment.
Extensions: none.
Support model: supports lists the canonical fields Day.js renders with its core formatter plus the AdvancedFormat and LocalizedFormat plugins.

Day.js mis-renders tokens it does not recognize at format time (rather than rejecting them), so converting to dayjs routes an unsupported field through onUnsupportedToken (reason unsupported-by-target) instead of emitting something broken.

Fields Day.js does not render

These canonical fields are outside Day.js’s support set, so converting them to dayjs is flagged. Example moment spellings are shown.

Field	e.g.
Era	`N` `NNNN` `NNNNN`
Week-numbering year, 2-digit	`gg` `GG`
Quarter, ordinal	`Qo`
Month, ordinal	`Mo`
ISO week of year, ordinal	`Wo`
Day of year	`DDD` `DDDD` `DDDo`
Weekday, number (ISO)	`E`
Fractional second, 1–2 digit	`S` `SS`

Plugin-gated tokens

Some fields Day.js renders only with a plugin loaded:

AdvancedFormat — quarter, day-of-month ordinal, week-of-year, ISO week-of-year, hour 1–24, week-numbering years, the Unix epoch, and time-zone name (Q, Do, w / wo / ww, W / WW, k / kk, gggg / GGGG, X, x, z).
LocalizedFormat — the L… presets.

rosetta-date emits these as-is; whether the plugin is actually loaded is the consumer’s concern (the same boundary supports draws between grammar and runtime configuration).

Localized presets

Through LocalizedFormat, dayjs spells the same L… family as momentjs:

Meaning	Token
Date, short / medium / long	`L` `ll` `LL`
Time, short / with seconds	`LT` `LTS`
Date + time, medium / long / full	`lll` `LLL` `LLLL`