fix(schema-org): avoid re-casting valid w3c date times

Fixes #296

Author: harlan-zw

packages/schema-org/src/nodes/JobPosting/index.test.ts

@@ -31,7 +31,7 @@ describe('defineJobPosting', () => {
           {
             "@id": "https://example.com/#job-posting",
             "@type": "JobPosting",
-            "datePosted": "2023-04-01T00:00:00.000Z",
+            "datePosted": "2023-04-01",
             "description": "<p>job description</p>",
             "employmentType": [
               "FULL_TIME",
@@ -49,7 +49,7 @@ describe('defineJobPosting', () => {
               "longitude": 4.8,
             },
             "title": "Job posting title",
-            "validThrough": "2024-04-01T00:00:00.000Z",
+            "validThrough": "2024-04-01",
           },
         ]
       `)

packages/schema-org/src/utils/index.ts

@@ -21,12 +21,24 @@ export function resolvableDateToDate(val: Date | string) {
   return typeof val === 'string' ? val : val.toString()
 }
 
+const IS_VALID_W3C_DATE = [
+  /(\d{4}-[01]\d-[0-3]\dT[0-2]\d:[0-5]\d:[0-5]\d\.\d+([+-][0-2]\d:[0-5]\d|Z))|(\d{4}-[01]\d-[0-3]\dT[0-2]\d:[0-5]\d:[0-5]\d([+-][0-2]\d:[0-5]\d|Z))|(\d{4}-[01]\d-[0-3]\dT[0-2]\d:[0-5]\d([+-][0-2]\d:[0-5]\d|Z))/,
+  /^\d{4}-[01]\d-[0-3]\d$/,
+  /^\d{4}-[01]\d$/,
+  /^\d{4}$/,
+]
+export function isValidW3CDate(d: string) {
+  return IS_VALID_W3C_DATE.some(r => r.test(d))
+}
+
 export function resolvableDateToIso(val: Date | string | undefined) {
   if (!val)
     return val
   try {
     if (val instanceof Date)
       return val.toISOString()
+    else if (isValidW3CDate(val))
+      return val
     else
       return new Date(Date.parse(val)).toISOString()
   }