frontend/routes/story/by-month.js

const express = require("express")
const router = express.Router()

const common = require("./common")
const {storyApi} = require("../../rpdata/api/Story")

const listTemplate = require("../../marko/page/story/list.marko")

router.get("/:yearmonth(\-{0,1}[0-9]{4}\-[0-9]{1,2})", common, async(req, res) => {
  try {
    const [year, month] = req.params.yearmonth.split("-").map(t => parseInt(t, 10))
    if (month > 12) {
      return res.status(400).end(`${month} is not a valid month number`)
    }

    // Month is zero-based, while input is one-based.
    const fromDate = new Date(Date.UTC(year, month - 1, 1))
    const toDate = new Date(Date.UTC(year, month, 1))
    const monthStr = `${fromDate}-${month > 9 ? month : '0' + month}`

    res.markoAsync(listTemplate, {
      stories: storyApi.list({earliestFictionalDate: fromDate, latestFictionalDate: toDate}), 
      menuMonth: monthStr,
      selected: {special: "month"},
    })
  } catch(err) {
    console.error(err)
  }
})

module.exports = router