Allow same day input when minimumNights={0}

src/components/DateRangePicker.jsx

@@ -400,6 +400,7 @@ export default class DateRangePicker extends React.Component {
       readOnly,
       phrases,
       isOutsideRange,
+      minimumNights,
       withPortal,
       withFullScreenPortal,
       displayFormat,
@@ -439,6 +440,7 @@ export default class DateRangePicker extends React.Component {
             reopenPickerOnClearDates={reopenPickerOnClearDates}
             keepOpenOnDateSelect={keepOpenOnDateSelect}
             isOutsideRange={isOutsideRange}
+            minimumNights={minimumNights}
             withFullScreenPortal={withFullScreenPortal}
             onDatesChange={onDatesChange}
             onFocusChange={this.onDateRangePickerInputFocus}

src/components/DateRangePickerInputController.jsx

@@ -3,7 +3,7 @@ import PropTypes from 'prop-types';
 import moment from 'moment';
 
 import momentPropTypes from 'react-moment-proptypes';
-import { forbidExtraProps } from 'airbnb-prop-types';
+import { forbidExtraProps, nonNegativeInteger } from 'airbnb-prop-types';
 
 import { DateRangePickerInputPhrases } from '../defaultPhrases';
 import getPhrasePropTypes from '../utils/getPhrasePropTypes';
@@ -15,7 +15,7 @@ import toLocalizedDateString from '../utils/toLocalizedDateString';
 import toISODateString from '../utils/toISODateString';
 
 import isInclusivelyAfterDay from '../utils/isInclusivelyAfterDay';
-import isInclusivelyBeforeDay from '../utils/isInclusivelyBeforeDay';
+import isBeforeDay from '../utils/isBeforeDay';
 
 import { START_DATE, END_DATE } from '../../constants';
 
@@ -41,6 +41,7 @@ const propTypes = forbidExtraProps({
   keepOpenOnDateSelect: PropTypes.bool,
   reopenPickerOnClearDates: PropTypes.bool,
   withFullScreenPortal: PropTypes.bool,
+  minimumNights: nonNegativeInteger,
   isOutsideRange: PropTypes.func,
   displayFormat: PropTypes.oneOfType([PropTypes.string, PropTypes.func]),
 
@@ -85,6 +86,7 @@ const defaultProps = {
   keepOpenOnDateSelect: false,
   reopenPickerOnClearDates: false,
   withFullScreenPortal: false,
+  minimumNights: 1,
   isOutsideRange: day => !isInclusivelyAfterDay(day, moment()),
   displayFormat: () => moment.localeData().longDateFormat('L'),
 
@@ -130,14 +132,15 @@ export default class DateRangePickerInputController extends React.Component {
     const {
       startDate,
       isOutsideRange,
+      minimumNights,
       keepOpenOnDateSelect,
       onDatesChange,
     } = this.props;
 
     const endDate = toMomentObject(endDateString, this.getDisplayFormat());
 
     const isEndDateValid = endDate && !isOutsideRange(endDate) &&
-      !isInclusivelyBeforeDay(endDate, startDate);
+      !(startDate && isBeforeDay(endDate, startDate.clone().add(minimumNights, 'days')));
     if (isEndDateValid) {
       onDatesChange({ startDate, endDate });
       if (!keepOpenOnDateSelect) this.onClearFocus();
@@ -166,10 +169,10 @@ export default class DateRangePickerInputController extends React.Component {
     const startDate = toMomentObject(startDateString, this.getDisplayFormat());
 
     let { endDate } = this.props;
-    const { isOutsideRange, onDatesChange, onFocusChange } = this.props;
+    const { isOutsideRange, minimumNights, onDatesChange, onFocusChange } = this.props;
     const isStartDateValid = startDate && !isOutsideRange(startDate);
     if (isStartDateValid) {
-      if (isInclusivelyBeforeDay(endDate, startDate)) {
+      if (startDate && isBeforeDay(endDate, startDate.clone().add(minimumNights, 'days'))) {
         endDate = null;
       }