import { McpServer } from '@modelcontextprotocol/sdk/server/mcp.js';
import { createMcpHandler } from 'agents/mcp';
import { z } from 'zod';
export interface Env {
DEFAULT_TIMEZONE?: string;
}
function formatTime(tz: string): string {
const now = new Date();
try {
const parts = new Intl.DateTimeFormat('en-CA', {
timeZone: tz,
year: 'numeric',
month: '2-digit',
day: '2-digit',
hour: '2-digit',
minute: '2-digit',
second: '2-digit',
hourCycle: 'h23'
})
.formatToParts(now)
.reduce<Record<string, string>>((acc, p) => {
if (p.type !== 'literal') acc[p.type] = p.value;
return acc;
}, {});
const utc = new Date(now.toLocaleString('en-US', { timeZone: 'UTC' }));
const zoned = new Date(now.toLocaleString('en-US', { timeZone: tz }));
const offsetMinutes = (zoned.getTime() - utc.getTime()) / 60000;
const sign = offsetMinutes >= 0 ? '+' : '-';
const abs = Math.abs(offsetMinutes);
const hh = String(Math.floor(abs / 60)).padStart(2, '0');
const mm = String(abs % 60).padStart(2, '0');
const offset = `${sign}${hh}:${mm}`;
return `${parts.year}-${parts.month}-${parts.day}T${parts.hour}:${parts.minute}:${parts.second}${offset}`;
} catch (err) {
throw new Error('Invalid timezone');
}
}
const server = new McpServer({
name: 'mcp-time-worker',
version: '0.2.0'
});
server.tool(
'get_time',
'Returns the current date and time (to the second) in a given IANA time zone. Defaults to env DEFAULT_TIMEZONE or Asia/Tokyo.',
z.object({
timezone: z.string().describe('IANA time zone, e.g. Asia/Tokyo').optional()
}),
async ({ timezone }) => {
const tz = timezone || currentEnv?.DEFAULT_TIMEZONE || 'Asia/Tokyo';
const now = formatTime(tz);
return {
content: [{ type: 'text', text: now }],
metadata: { timezone: tz }
};
}
);
const handler = createMcpHandler(server, {
cors: { allowOrigin: '*' }
});
let currentEnv: Env | undefined;
export default {
fetch(request: Request, env: Env, ctx: ExecutionContext): Response | Promise<Response> {
currentEnv = env;
return handler(request, env, ctx);
}
};
