Add unix-timestamp-converter extension

extensions/unix-timestamp-converter/.gitignore

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+# See https://help.github.com/articles/ignoring-files/ for more about ignoring files.
+
+# dependencies
+/node_modules
+
+# Raycast specific files
+raycast-env.d.ts
+.raycast-swift-build
+.swiftpm
+compiled_raycast_swift
+
+# misc
+.DS_Store

extensions/unix-timestamp-converter/.prettierrc

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+{
+  "printWidth": 120,
+  "singleQuote": false
+}

extensions/unix-timestamp-converter/CHANGELOG.md

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+# Unix Timestamp Converter Changelog
+
+## [Initial Release] - {PR_MERGE_DATE}
+
+- Initial release
+- Added conversion from Unix timestamps to local date and time for multiple countries
+- Added generation of Unix timestamps from human-readable date and time, considering the selected country's timezone
+- Supported timezones: Japan, USA (New York/Los Angeles), Korea, Thailand
+- Supported multiple display formats: Japanese, Korean, Thai, ISO, US
+- One-click copy to clipboard for conversion results

extensions/unix-timestamp-converter/README.md

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+# Unix Timestamp Converter
+
+A Raycast extension to convert between Unix timestamps and human-readable date and time formats.
+Supports multiple time zones and display formats, including Japan, United States, Korea, and Thailand.
+
+## Features
+
+- Convert Unix timestamps to local date and time for various countries
+- Generate Unix timestamps from human-readable date and time
+- Time zone support: Japan, United States (New York/Los Angeles), Korea, Thailand
+- Multiple display formats: Japanese, Korean, Thai, ISO, US
+- One-click copy to clipboard for conversion results
+
+## Usage
+
+### 1. Convert Timestamp
+
+- Enter a Unix timestamp, select a country and display format to convert it to the local date and time of the selected country.
+- Click "Convert & Copy" to copy the result to the clipboard.
+
+### 2. Generate Timestamp
+
+- Enter year, month, day, hour, minute, second, and select a country (time zone). The extension will generate a Unix timestamp as if the entered date and time are in the selected country's local time.
+  Example: If you select "Japan", the input is treated as Japan Standard Time (UTC+9).
+- Click "Convert & Copy" to copy the Unix timestamp to the clipboard.
+
+
+Install from the Raycast Store and enjoy quick timestamp conversions!

extensions/unix-timestamp-converter/eslint.config.js

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+const { defineConfig } = require("eslint/config");
+const raycastConfig = require("@raycast/eslint-config");
+
+module.exports = defineConfig([
+  ...raycastConfig,
+]);