Refactor expiry logic into utility function

src/components/Job.jsx

@@ -3,24 +3,23 @@ import { Link } from "gatsby";
 
 import Badge from "./Badge";
 import jobToMarkdown from "../jobToMarkdown.mjs";
+import { isJobExpired } from "../utils.mjs";
 
 
 const Job = ({ job }) => {
   const processedJob = React.useMemo(() => jobToMarkdown(job), [job]);
 
   const isExpired = React.useMemo(() => {
-    if (!processedJob || !processedJob.expires) return false;
-    const today = new Date();
-    return new Date(`${processedJob.expires}T23:59:59.999-12:00`) < today;
-  }, [processedJob]);
+    return isJobExpired(job);
+  }, [job]);
 
   if (processedJob === undefined) {
     console.log("We don't expect an empty job posting; aborting");
     return <div>Empty job posting</div>;
   }
 
   return (
-    <div className="job">
+    <div className={`job${isExpired ? " expired" : ""}`}>
       <div className="badges">
         { processedJob.badges &&
           processedJob.badges.map((badge) =>

src/filter-jobs.mjs

@@ -1,24 +1,28 @@
+import { isJobExpired } from "./utils.mjs";
+
 const filterJobs = (jobs, filter) => {
-  // Filter out expired jobs.  Use Howland Island timezone to ensure
-  // that everyone sees the job on its last day.
   const today = new Date();
+
+  // Filter out expired jobs if requested.
   if (!filter.showExpired) {
-    jobs = jobs.filter((job) => new Date(`${job.expires}T23:59:59.999-12:00`) > today)
+    jobs = jobs.filter((job) => !isJobExpired(job, today));
   }
 
   if (filter.fullTime) {
-    jobs = jobs.filter((job) => job.percentTime === 100)
+    jobs = jobs.filter((job) => job.percentTime === 100);
   }
 
   if (filter.ossTimeGt) {
-    jobs = jobs.filter((job) => job.percentOSS >= parseInt(filter.ossTimeGt))
+    // Ensure we're comparing numbers
+    const minOSS = parseInt(filter.ossTimeGt, 10);
+    jobs = jobs.filter((job) => job.percentOSS >= minOSS);
   }
 
   if (filter.remote) {
     jobs = jobs.filter((job) => (job.location || 'remote').toLowerCase() === 'remote' );
   }
 
   return jobs;
-}
+};
 
 export default filterJobs;

src/utils.mjs

@@ -0,0 +1,19 @@
+/**
+ * Checks if a job has expired using the 'Anywhere on Earth' (-12:00) timezone.
+ */
+export const isJobExpired = (job, now = new Date()) => {
+  try {
+    const expiresStr = String(job.expires).trim();
+    const expiryDate = new Date(`${expiresStr}T23:59:59.999-12:00`);
+
+    // If date is malformed, default to NOT expired to avoid hiding jobs by mistake.
+    if (isNaN(expiryDate.getTime())) {
+      return false;
+    }
+
+    return expiryDate < now;
+  } catch (error) {
+    // Fail-safe: malformed data shouldn't break the entire jobs board UI.
+    return false;
+  }
+};