Date Input

DateInput shows a calendar picker and returns the selected date.

Signature

picked := ui.DateInput(label string, opts ...dateinput.Option) *time.Time

picked is nil until the user chooses a date.

Helper	Purpose	Default
`dateinput.WithPlaceholder("YYYY‑MM‑DD")`	Placeholder when no value selected	`""`
`dateinput.WithDefaultValue(t)`	Pre‑fill with a date	nil
`dateinput.WithRequired(true)`	Mark field as required inside a `Form`	`false`
`dateinput.WithDisabled(true)`	Render read‑only	`false`
`dateinput.WithFormat("MM/DD/YYYY")`	Custom display/layout format	`"YYYY/MM/DD"`
`dateinput.WithMaxValue(t)`	Latest selectable date	nil
`dateinput.WithMinValue(t)`	Earliest selectable date	nil
`dateinput.WithLocation(loc)`	Time‑zone for parsing/formatting	`time.Local`

The format uses [Moment.js‑style] tokens (e.g. YYYY, MM, DD). It does not use Go’s reference date layout.

State is stored as time.Time (date‑only part preserved). Changing the format does not affect stored values.
Validation (Required, Min/MaxValue) happens client‑side before page rerun.
WithLocation matters if you later compare the value with time‑zoned dates.

birthday := ui.DateInput("Birthday")
if birthday != nil {
    log.Println("Selected:", birthday.Format(time.DateOnly))
}

ui.DateInput("Start",
    dateinput.WithPlaceholder("MM/DD/YYYY"),
    dateinput.WithFormat("MM/DD/YYYY"),
)

now := time.Now()
ui.DateInput("Deadline",
    dateinput.WithMinValue(now),
    dateinput.WithMaxValue(now.AddDate(0, 0, 30)),
)

ui.DateInput("Creation date",
    dateinput.WithDefaultValue(time.Now()),
    dateinput.WithDisabled(true),
)