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fix(datetime-button): fix initial text not obeying datetime constraints #31218

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fix(datetime-button): fix initial text not obeying datetime constraints #31218

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f82ea68
fix(datetime-button): fix initial value not following datetime constr…
droc101 Jun 15, 2026
ba0ebeb
Merge branch 'ionic-team:main' into main
droc101 Jun 17, 2026
7d95269
refactor(datetime-button): communicate default datetime via internal …
droc101 Jun 17, 2026
4824122
fix(datetime-button): fix linter errors (npm run lint.fix)
droc101 Jun 18, 2026
ef4c1cd
test(datetime-button): add tests for datetime constraints
droc101 Jun 18, 2026
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1 change: 1 addition & 0 deletions core/api.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -545,6 +545,7 @@ ion-datetime,prop,value,null | string | string[] | undefined,undefined,false,fal
ion-datetime,prop,yearValues,number | number[] | string | undefined,undefined,false,false
ion-datetime,method,cancel,cancel(closeOverlay?: boolean) => Promise<void>
ion-datetime,method,confirm,confirm(closeOverlay?: boolean) => Promise<void>
ion-datetime,method,getClosestDate,getClosestDate(date: Date) => Promise<Date>
ion-datetime,method,reset,reset(startDate?: string) => Promise<void>
ion-datetime,event,ionBlur,void,true
ion-datetime,event,ionCancel,void,true
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5 changes: 5 additions & 0 deletions core/src/components.d.ts
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Expand Up @@ -961,6 +961,11 @@ export namespace Components {
* Formatting options for dates and times. Should include a 'date' and/or 'time' object, each of which is of type [Intl.DateTimeFormatOptions](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Intl/DateTimeFormat/DateTimeFormat#options).
*/
"formatOptions"?: FormatOptions;
/**
* Get the closest valid Date according to the restrictions on this Datetime
* @param date The Date to find the closest valid value for
*/
"getClosestDate": (date: Date) => Promise<Date>;
/**
* Used to apply custom text and background colors to specific dates. Can be either an array of objects containing ISO strings and colors, or a callback that receives an ISO string and returns the colors. Only applies to the `date`, `date-time`, and `time-date` presentations, with `preferWheel="false"`.
*/
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10 changes: 5 additions & 5 deletions core/src/components/datetime-button/datetime-button.tsx
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Original file line number Diff line number Diff line change
Expand Up @@ -7,7 +7,6 @@ import { createColorClasses } from '@utils/theme';
import { getIonMode } from '../../global/ionic-global';
import type { Color } from '../../interface';
import type { DatetimePresentation } from '../datetime/datetime-interface';
import { getToday } from '../datetime/utils/data';
import { getLocalizedDateTime, getLocalizedTime } from '../datetime/utils/format';
import { getHourCycle } from '../datetime/utils/helpers';
import { parseDate } from '../datetime/utils/parse';
Expand Down Expand Up @@ -125,7 +124,7 @@ export class DatetimeButton implements ComponentInterface {
overlayEl.classList.add('ion-datetime-button-overlay');
}

componentOnReady(datetimeEl, () => {
componentOnReady(datetimeEl, async () => {
const datetimePresentation = (this.datetimePresentation = datetimeEl.presentation || 'date-time');

/**
Expand All @@ -138,7 +137,7 @@ export class DatetimeButton implements ComponentInterface {
* to re-render the displayed
* text in the buttons.
*/
this.setDateTimeText();
await this.setDateTimeText();
addEventListener(datetimeEl, 'ionValueChange', this.setDateTimeText);

/**
Expand Down Expand Up @@ -189,7 +188,7 @@ export class DatetimeButton implements ComponentInterface {
* ion-datetime and then format it according
* to the locale specified on ion-datetime.
*/
private setDateTimeText = () => {
private setDateTimeText = async () => {
const { datetimeEl, datetimePresentation } = this;

if (!datetimeEl) {
Expand All @@ -204,7 +203,8 @@ export class DatetimeButton implements ComponentInterface {
* Both ion-datetime and ion-datetime-button default
* to today's date and time if no value is set.
*/
const parsedDatetimes = parseDate(parsedValues.length > 0 ? parsedValues : [getToday()]);
const defaultDatetime = [(await datetimeEl.getClosestDate(new Date())).toISOString()];
const parsedDatetimes = parseDate(parsedValues.length > 0 ? parsedValues : defaultDatetime);

@thetaPC thetaPC Jun 17, 2026

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getClosestDate is awaited on every call, but the result is thrown away whenever parsedValues is non-empty (i.e. whenever the datetime has a value). Since getClosestDate is a Stencil @Method, this is an async cross-component round-trip on every ionValueChange, just to discard the result. Move it into the no-value branch and also update the comment:

Suggested change
const defaultDatetime = [(await datetimeEl.getClosestDate(new Date())).toISOString()];
const parsedDatetimes = parseDate(parsedValues.length > 0 ? parsedValues : defaultDatetime);
/**
* Both ion-datetime and ion-datetime-button default to today's date
* and time if no value is set. The datetime is queried for the closest
* valid value so the button respects the same constraints (min, max,
* minuteValues, etc.) that the datetime applies to its own default.
*/
let valuesToParse = parsedValues;
if (valuesToParse.length === 0) {
const closestDate = await datetimeEl.getClosestDate(new Date());
valuesToParse = [closestDate.toISOString()];
}
const parsedDatetimes = parseDate(valuesToParse);


if (!parsedDatetimes) {
return;
Expand Down
64 changes: 47 additions & 17 deletions core/src/components/datetime/datetime.tsx
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Original file line number Diff line number Diff line change
Expand Up @@ -35,7 +35,13 @@ import {
getTimeColumnsData,
getCombinedDateColumnData,
} from './utils/data';
import { formatValue, getLocalizedDateTime, getLocalizedTime, getMonthAndYear } from './utils/format';
import {
formatValue,
getLocalizedDateTime,
getLocalizedTime,
getMonthAndYear,
removeDateTzOffset,
} from './utils/format';
import { isLocaleDayPeriodRTL, isMonthFirstLocale, getNumDaysInMonth, getHourCycle } from './utils/helpers';
import {
calculateHourFromAMPM,
Expand Down Expand Up @@ -604,6 +610,45 @@ export class Datetime implements ComponentInterface {
}
}

/**
* Get the closest valid DatetimeParts according to the restrictions on this Datetime
* @param parts The DatetimeParts to find the closest valid value for
*/
private getClosestDatetimeParts(parts: DatetimeParts) {
const hourValues = (this.parsedHourValues = convertToArrayOfNumbers(this.hourValues));
const minuteValues = (this.parsedMinuteValues = convertToArrayOfNumbers(this.minuteValues));
const monthValues = (this.parsedMonthValues = convertToArrayOfNumbers(this.monthValues));
const yearValues = (this.parsedYearValues = convertToArrayOfNumbers(this.yearValues));
const dayValues = (this.parsedDayValues = convertToArrayOfNumbers(this.dayValues));
return getClosestValidDate({
refParts: parts,
monthValues,
dayValues,
yearValues,
hourValues,
minuteValues,
minParts: this.minParts,
maxParts: this.maxParts,
});
}

/**
* Get the closest valid Date according to the restrictions on this Datetime
* @param date The Date to find the closest valid value for
*/
@Method()
async getClosestDate(date: Date) {
const closest = this.getClosestDatetimeParts({
month: date.getMonth(),
day: date.getDay(),

@thetaPC thetaPC Jun 17, 2026

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DatetimeParts and the native Date API don't use the same conventions, and two fields are mismatched here:

  1. month is off by one. Date.getMonth() is 0-indexed (January is 0), but DatetimeParts.month is 1-indexed (January is 1). So today, June, comes through as month 5, which DatetimeParts reads as May.

  2. day is the wrong field entirely. Date.getDay() returns the day of the week (0–6, Sun–Sat), not the day of the month. The day of the month comes from Date.getDate().

You can reproduce it with a plain no-value date picker (no constraints needed): the calendar lands on Jun 17, 2026 but the button reads "May 3, 2026".

Both of these can be seen with:

<ion-item>
  <ion-label>Start Date</ion-label>
  <ion-datetime-button slot="end" datetime="no-value-date"></ion-datetime-button>
</ion-item>

<!-- keep-contents-mounted makes the datetime (and the button text) compute on load, so the mismatch shows immediately -->
<ion-modal keep-contents-mounted="true">
  <ion-datetime locale="en-US" presentation="date" id="no-value-date"></ion-datetime>
</ion-modal>

Fix:

Suggested change
month: date.getMonth(),
day: date.getDay(),
month: date.getMonth() + 1,
day: date.getDate(),

year: date.getFullYear(),
dayOfWeek: date.getDay(),
hour: date.getHours(),
minute: date.getMinutes(),
});
return removeDateTzOffset(new Date(convertDataToISO(closest)));
}
Comment on lines +629 to +639

@thetaPC thetaPC Jun 17, 2026

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I'd recommend an @internal method instead of a new public one.

componentWillLoad already computes this.defaultParts (today snapped to the closest valid value via getClosestValidDate, datetime.tsx:1540) — exactly what the button is trying to reconstruct. So the button can just read that value rather than recomputing it from a Date, which also guarantees the button and picker never disagree.

Making it @internal follows how these two already communicate (the button listens to the @internal ionValueChange event), and avoids adding public API to document and support. It also avoids reconstructing parts from a Date (the ISO -> removeDateTzOffset round-trip), which is where the getMonth()/getDay() mistakes lived.

Suggested change
/**
* Get the closest valid Date according to the restrictions on this Datetime
* @param date The Date to find the closest valid value for
*/
@Method()
async getClosestDate(date: Date) {
const closest = this.getClosestDatetimeParts({
month: date.getMonth(),
day: date.getDay(),
year: date.getFullYear(),
dayOfWeek: date.getDay(),
hour: date.getHours(),
minute: date.getMinutes(),
});
return removeDateTzOffset(new Date(convertDataToISO(closest)));
}
/**
* Returns the default parts the datetime falls back to when no value is set:
* today's date and time snapped to the closest value allowed by the
* component's constraints (`min`, `max`, and the `*Values` props).
*
* @internal
*/
@Method()
async getDefaultPart(): Promise<DatetimeParts> {
return this.defaultParts;
}

The datetime-button.tsx then reads it in the no-value branch

/**
     * Both ion-datetime and ion-datetime-button default to today's date and
     * time if no value is set. We read the datetime's computed default so the
     * button respects the same constraints (min, max, minuteValues, etc.) that
     * the datetime applies to its own fallback, instead of using a raw "now".
     */
    const parsedDatetimes =
      parsedValues.length > 0 ? parseDate(parsedValues) : [await datetimeEl.getDefaultPart()];


private warnIfIncorrectValueUsage = () => {
const { multiple, value } = this;
if (!multiple && Array.isArray(value)) {
Expand Down Expand Up @@ -1495,27 +1540,12 @@ export class Datetime implements ComponentInterface {
warnIfTimeZoneProvided(el, formatOptions);
}

const hourValues = (this.parsedHourValues = convertToArrayOfNumbers(this.hourValues));
const minuteValues = (this.parsedMinuteValues = convertToArrayOfNumbers(this.minuteValues));
const monthValues = (this.parsedMonthValues = convertToArrayOfNumbers(this.monthValues));
const yearValues = (this.parsedYearValues = convertToArrayOfNumbers(this.yearValues));
const dayValues = (this.parsedDayValues = convertToArrayOfNumbers(this.dayValues));

const todayParts = (this.todayParts = parseDate(getToday())!);

this.processMinParts();
this.processMaxParts();

this.defaultParts = getClosestValidDate({
refParts: todayParts,
monthValues,
dayValues,
yearValues,
hourValues,
minuteValues,
minParts: this.minParts,
maxParts: this.maxParts,
});
this.defaultParts = this.getClosestDatetimeParts(todayParts);

this.processValue(this.value);

Expand Down
2 changes: 1 addition & 1 deletion packages/angular/src/directives/proxies.ts
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Expand Up @@ -635,7 +635,7 @@ Set `scrollEvents` to `true` to enable.

@ProxyCmp({
inputs: ['cancelText', 'clearText', 'color', 'dayValues', 'disabled', 'doneText', 'firstDayOfWeek', 'formatOptions', 'highlightedDates', 'hourCycle', 'hourValues', 'isDateEnabled', 'locale', 'max', 'min', 'minuteValues', 'mode', 'monthValues', 'multiple', 'name', 'preferWheel', 'presentation', 'readonly', 'showAdjacentDays', 'showClearButton', 'showDefaultButtons', 'showDefaultTimeLabel', 'showDefaultTitle', 'size', 'titleSelectedDatesFormatter', 'value', 'yearValues'],
methods: ['confirm', 'reset', 'cancel']
methods: ['confirm', 'reset', 'cancel', 'getClosestDate']
})
@Component({
selector: 'ion-datetime',
Expand Down
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