Fix/5939 : The calendar doesn't display the startDate as first month

[tejas-fullstack]

• Fixes issue Calendar doesn't display the startDate as first month #5939

---

name: Pull Request
about: Create a pull request to improve this repository
title: "Fix: Calendar displays startDate as first month #5939"
labels: "bug"
assignees: ""

Description

Linked issue: #5939

Problem
The calendar in react-datepicker does not display the startDate as the first month when a date range is selected or when a preselected date is set. Users expected the calendar to open showing the startDate as the first visible month.

Changes

• Added handling for selectsRange and monthSelectedIn state to ensure the calendar opens at the startDate.
• Updated componentDidUpdate to reset monthSelectedIn when selectsRange is true.
• Added relevant tests to confirm calendar behavior for startDate selection.

Screen Recorder

fix-5939.mp4

To reviewers

• Verify that the calendar opens with the startDate as the first visible month.
• Check that no regression occurs for single-date selection.

Contribution checklist

• I have followed the contributing guidelines.
• I have added sufficient test coverage for my changes.
• I have formatted my code with Prettier and checked for linting issues with ESLint for code readability.