feat: calendar core

.browserslistrc

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+# Browsers we support
+Chrome >= 84
+Firefox >= 90
+Edge >= 84
+Safari >= 15
+iOS >= 15
+opera >= 70

.editorconfig

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+root = true
+
+[*]
+charset = utf-8
+indent_style = space
+indent_size = 2
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true

.gitattributes

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+# Auto detect text files and perform LF normalization
+* text=auto eol=lf

.github/FUNDING.yml

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+github: tannerlinsley

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: '🐛 Bug report'
+description: Create a report to help us improve
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thank you for reporting an issue :pray:.
+
+        This issue tracker is for reporting bugs found in `time` (https://github.com/tanstack/time).
+        If you have a question about how to achieve something and are struggling, please post a question
+        inside of `time` Discussions tab: https://github.com/tanstack/time/discussions
+
+        Before submitting a new bug/issue, please check the links below to see if there is a solution or question posted there already:
+         - `time` Issues tab: https://github.com/tanstack/time/issues?q=is%3Aissue+is%3Aopen+sort%3Aupdated-desc
+         - `time` closed issues tab: https://github.com/tanstack/time/issues?q=is%3Aissue+sort%3Aupdated-desc+is%3Aclosed
+         - `time` Discussions tab: https://github.com/tanstack/time/discussions
+
+        The more information you fill in, the better the community can help you.
+  - type: textarea
+    id: description
+    attributes:
+      label: Describe the bug
+      description: Provide a clear and concise description of the challenge you are running into.
+    validations:
+      required: true
+  - type: textarea
+    id: steps
+    attributes:
+      label: Steps to Reproduce the Bug or Issue
+      description: Describe the steps we have to take to reproduce the behavior.
+      placeholder: |
+        1. Go to '...'
+        2. Click on '....'
+        3. Scroll down to '....'
+        4. See error
+    validations:
+      required: true
+  - type: textarea
+    id: expected
+    attributes:
+      label: Expected behavior
+      description: Provide a clear and concise description of what you expected to happen.
+      placeholder: |
+        As a user, I expected ___ behavior but i am seeing ___
+    validations:
+      required: true
+  - type: textarea
+    id: screenshots_or_videos
+    attributes:
+      label: Screenshots or Videos
+      description: |
+        If applicable, add screenshots or a video to help explain your problem.
+        For more information on the supported file image/file types and the file size limits, please refer
+        to the following link: https://docs.github.com/en/github/writing-on-github/working-with-advanced-formatting/attaching-files
+      placeholder: |
+        You can drag your video or image files inside of this editor ↓
+  - type: textarea
+    id: platform
+    attributes:
+      label: Platform
+      value: |
+        - OS: [e.g. macOS, Windows, Linux]
+        - Browser: [e.g. Chrome, Safari, Firefox]
+        - Version: [e.g. 91.1]
+    validations:
+      required: true
+  - type: textarea
+    id: additional
+    attributes:
+      label: Additional context
+      description: Add any other context about the problem here.

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: 🤔 Feature Requests & Questions
+    url: https://github.com/tanstack/time/discussions
+    about: Please ask and answer questions here.
+  - name: 💬 Community Chat
+    url: https://discord.gg/mQd7egN
+    about: A dedicated discord server hosted by Tanner Linsley
+  - name: 💬 Tanstack Twitter
+    url: https://twitter.com/tan_stack
+    about: Stay up to date with new releases of our libraries

.github/workflows/ci.yml

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+name: ci
+
+on:
+  workflow_dispatch:
+    inputs:
+      tag:
+        description: override release tag
+        required: false
+  push:
+    branches: ['main', 'alpha', 'beta']
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.number || github.ref }}
+  cancel-in-progress: true
+
+env:
+  NX_CLOUD_ACCESS_TOKEN: ${{ secrets.NX_CLOUD_ACCESS_TOKEN }}
+
+jobs:
+  test-and-publish:
+    name: Test & Publish
+    if: github.repository == 'TanStack/time'
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: '0'
+      - name: Setup pnpm
+        uses: pnpm/action-setup@v2
+        with:
+          version: 8
+      - name: Setup Node
+        uses: actions/setup-node@v4
+        with:
+          node-version-file: .nvmrc
+          cache: pnpm
+      - name: Start Nx Agents
+        run: npx nx-cloud start-ci-run --distribute-on=".nx/workflows/dynamic-changesets.yaml"
+      - name: Install dependencies
+        run: pnpm install --frozen-lockfile --prefer-offline
+      - name: Run Tests
+        run: pnpm run test:ci --parallel=3
+      - name: Stop Nx Agents
+        if: ${{ always() }}
+        run: npx nx-cloud stop-all-agents
+      - name: Publish
+        run: |
+          git config --global user.name 'Tanner Linsley'
+          git config --global user.email 'tannerlinsley@users.noreply.github.com'
+          npm config set '//registry.npmjs.org/:_authToken' "${NPM_TOKEN}"
+          pnpm run cipublish
+        env:
+          GITHUB_TOKEN: ${{ secrets.GH_TOKEN }}
+          GH_TOKEN: ${{ secrets.GH_TOKEN }}
+          NPM_TOKEN: ${{ secrets.NPM_TOKEN }}
+          NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}
+          TAG: ${{ inputs.tag }}

.github/workflows/pr.yml

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+name: pr
+
+on:
+  pull_request:
+    paths-ignore:
+      - 'docs/**'
+      - 'media/**'
+      - '**/*.md'
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.number || github.ref }}
+  cancel-in-progress: true
+
+env:
+  NX_CLOUD_ACCESS_TOKEN: ${{ secrets.NX_CLOUD_ACCESS_TOKEN }}
+
+jobs:
+  test:
+    name: Test
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+      - name: Setup pnpm
+        uses: pnpm/action-setup@v2
+        with:
+          version: 8
+      - name: Setup Node
+        uses: actions/setup-node@v4
+        with:
+          node-version-file: .nvmrc
+          cache: pnpm
+      - name: Start Nx Agents
+        run: npx nx-cloud start-ci-run --distribute-on=".nx/workflows/dynamic-changesets.yaml"
+      - name: Install dependencies
+        run: pnpm install --frozen-lockfile --prefer-offline
+      - name: Get base and head commits for `nx affected`
+        uses: nrwl/nx-set-shas@v3
+        with:
+          main-branch-name: 'main'
+      - name: Run Checks
+        run: pnpm run test:pr --parallel=3
+      - name: Stop Nx Agents
+        if: ${{ always() }}
+        run: npx nx-cloud stop-all-agents

.gitignore

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+
+# See https://help.github.com/ignore-files/ for more about ignoring files.
+
+# dependencies
+node_modules
+package-lock.json
+yarn.lock
+
+# builds
+build
+coverage
+dist
+
+# misc
+.DS_Store
+.env
+.env.local
+.env.development.local
+.env.test.local
+.env.production.local
+.next
+
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+.history
+size-plugin.json
+stats-hydration.json
+stats.json
+stats.html
+.vscode/settings.json
+
+*.log
+.cache
+.idea
+.nx/cache
+.nx/workspace-data
+.pnpm-store
+.tsup
+
+vite.config.js.timestamp-*
+vite.config.ts.timestamp-*

.npmrc

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+prefer-workspace-packages=true

.nvmrc

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+v18.19.0

.nx/workflows/dynamic-changesets.yaml

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+distribute-on:
+  small-changeset: 8 linux-medium-js
+  medium-changeset: 10 linux-medium-js
+  large-changeset: 12 linux-medium-js

.prettierignore

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+**/.next
+**/.nx/cache
+**/.svelte-kit
+**/build
+**/coverage
+**/dist
+**/docs
+**/codemods/**/__testfixtures__
+pnpm-lock.yaml
+
+/.nx/workspace-data

.prettierrc

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+{
+  "semi": false,
+  "singleQuote": true,
+  "trailingComma": "all"
+}

.vscode/mcp.json

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+{
+  "servers": {
+    "nx-mcp": {
+      "type": "sse",
+      "url": "http://localhost:9811/sse"
+    }
+  }
+}

ARCHITECTURE.md

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+## Overview
+
+`@tanstack/time` is a headless utility library designed to facilitate the creation of time and calendar components across various JavaScript frameworks, including TypeScript/JavaScript, React, Solid, Vue, Svelte, and Angular. This document provides an overview of the architecture and design principles of the library.
+
+
+## Design Principles
+
+### Headless utilities
+The library provides core functionalities without imposing any UI constraints, allowing developers to build custom UI components tailored to their specific needs.
+
+### Framework agnostic
+Core logic is implemented in a framework-agnostic manner, ensuring compatibility across multiple frameworks.
+
+### Modular and extensible
+The library is designed to be modular, enabling developers to use only the parts they need and extend functionalities when required.
+
+### Type safety
+Leveraging TypeScript to provide a strongly typed API, ensuring better developer experience and reducing runtime errors.
+
+### Standards-based
+The library uses standards-based core logic, aligning with modern web standards and best practices.
+Internationalization and localization
+TanStack Time is designed to handle various locales, calendars, and timezones, addressing the complexities of global date and time representation.
+Core Modules
+### Time utilities
+The library provides a set of utilities for working with time, including parsing, formatting, and manipulating time values.
+
+### Calendar utilities
+Calendar utilities enable developers to work with calendar-related functionalities, such as date range calculations, month view generation, and event scheduling.
+
+### Date manipulation
+Utilities for performing date math, comparisons, grouping, and range operations.
+Formatting
+Flexible date and time formatting options based on locale, calendar, and timezone.
+
+## Project Structure
+
+The project is structured as follows:
+```lua
+├── packages                # Contains individual packages for different frameworks
+│   ├── time                # Core logic shared across all packages
+│        ├── src            # Core logic implementation
+│        ├── test           # Unit tests
+│   ├── {framework}-time    # Adapters for specific frameworks (e.g., react-time, vue-time)
+├── examples                # Example applications demonstrating library usage
+├── docs                    # Documentation files
+├── scripts                 # Build and test scripts
+```
+
+The core logic is implemented in the `time` package, which contains the shared functionality across all framework-specific packages. Each framework-specific package (e.g., `react-time`, `vue-time`) contains the necessary adapters to integrate the core logic with the respective framework.
+
+
+## API Design
+
+The API of @tanstack/time is designed to be intuitive and flexible. It provides a set of core functions that can be easily composed to build complex time and calendar functionalities. The API is consistent across different frameworks, ensuring a seamless developer experience when switching between frameworks.
+
+### Key API features include:
+
+Parsing of RFC 3339 date time strings, epoch time, and Date objects
+Formatting based on Intl.DateTimeFormat standards
+Date math operations
+Comparison and sorting utilities
+Grouping and range operations
+Timezone and DST handling
+
+## Extensibility
+The library is designed to be extensible, allowing developers to add custom functionalities or modify existing ones to suit their requirements. Developers can extend the core logic by creating custom utilities or by composing existing utilities in new ways.
+
+### Temporal API Integration
+TanStack Time leverages the upcoming Temporal API, using a polyfill maintained by the TC39 champions until it's fully ratified and implemented by all major browsers. This ensures forward compatibility and access to advanced date and time manipulation features.
+
+### Internationalization
+The library is built with internationalization in mind, addressing the complexities of different calendar systems, date formats, and time representations across various cultures and regions.
+
+### Performance Considerations
+
+Memoization is used for formatters to improve performance when repeatedly formatting dates.
+The library provides options for working with "simple" date representations (strings or numbers) to facilitate easier memoization in application code.
+
+### Compatibility
+While focusing on modern standards, TanStack Time also provides compatibility options for working with legacy date formats and parsing methods, ensuring broad applicability across different project requirements.