More improvements in the built-in `isTimestamp` function (see #847)

docs/api.md

@@ -436,8 +436,9 @@ Constructs a new JSONEditor.
 
   If `true` (default), a tag with the date/time of a timestamp is displayed
   right from values containing a timestamp. By default, a value is 
-  considered a timestamp when it is a number and it's field name contains any
-  of the following strings (case insensitive): `'date'`, `'time'`, `'created'`,
+  considered a timestamp when it is (a) an integer number with a value larger 
+  than Jan 1th 2000, `946684800000`, or (b) it's field name contains any of the
+  following strings (case insensitive): `'date'`, `'time'`, `'created'`,
   `'updated'`, `'deleted'`.
   
   When `timestampTag` a is a function, a timestamp tag will be displayed when 

gulpfile.js

@@ -135,7 +135,7 @@ gulp.task('embed-json-worker', function (done) {
 
   const workerDataUrl = 'data:application/javascript;base64,' + btoa(workerScript)
 
-  fs.writeFileSync(workerEmbeddedFile, 'module.exports = \'' + workerDataUrl + '\';\n')
+  fs.writeFileSync(workerEmbeddedFile, 'module.exports = \'' + workerDataUrl + '\'\n')
 
   done()
 })

src/js/Node.js

@@ -18,7 +18,7 @@ import {
   getAbsoluteTop,
   getInnerText,
   getType,
-  isTimestampFieldName,
+  isTimestamp,
   isUrl,
   isValidColor,
   makeFieldTooltip,
@@ -1954,7 +1954,7 @@ export class Node {
     }
 
     if (timestampTag === true) {
-      return isTimestampFieldName(this.field)
+      return isTimestamp(this.field, this.value)
     }
 
     return false

src/js/util.js

@@ -7,6 +7,7 @@ import jsonMap from 'json-source-map'
 import { translate } from './i18n'
 
 const MAX_ITEMS_FIELDS_COLLECTION = 10000
+const YEAR_2000 = 946684800000
 
 /**
  * Parse JSON using the parser built-in in the browser.
@@ -1363,14 +1364,29 @@ const TIMESTAMP_FIELDS = [
 ]
 
 /**
- * Test whether some field has a naming like "date" or "time"
+ * Test whether some field contains a timestamp. This is based
+ * on the number being large has a naming like "date" or "time"
  * @param {string} field
+ * @param {number} value
  * @return {boolean}
  */
-export function isTimestampFieldName (field) {
-  const fieldUpper = field.toUpperCase()
+export function isTimestamp (field, value) {
+  if (typeof value === 'number' &&
+    value > YEAR_2000 &&
+    isFinite(value) &&
+    Math.floor(value) === value &&
+    !isNaN(new Date(value).valueOf())
+  ) {
+    return true
+  }
 
-  return TIMESTAMP_FIELDS.some(search => fieldUpper.indexOf(search) !== -1)
+  if (typeof field === 'string') {
+    const fieldUpper = field.toUpperCase()
+
+    return TIMESTAMP_FIELDS.some(search => fieldUpper.indexOf(search) !== -1)
+  }
+
+  return false
 }
 
 /**

test/util.test.js

@@ -6,7 +6,8 @@ import {
   get,
   getChildPaths,
   getIndexForPosition,
-  isObject, isTimestampFieldName,
+  isObject,
+  isTimestamp,
   limitCharacters,
   makeFieldTooltip,
   parsePath,
@@ -477,14 +478,16 @@ describe('util', () => {
   })
 
   it('should test whether a field is a timestamp', () => {
-    assert.strictEqual(isTimestampFieldName('dateCreated'), true)
-    assert.strictEqual(isTimestampFieldName('updatedAt'), true)
-    assert.strictEqual(isTimestampFieldName('deletedAt'), true)
-    assert.strictEqual(isTimestampFieldName('DATE'), true)
-    assert.strictEqual(isTimestampFieldName('TIMESTAMP'), true)
-    assert.strictEqual(isTimestampFieldName('timestamp'), true)
-    assert.strictEqual(isTimestampFieldName('hello'), false)
-    assert.strictEqual(isTimestampFieldName('TIM'), false)
+    assert.strictEqual(isTimestamp('foo', 1574809200000), true)
+    assert.strictEqual(isTimestamp('foo', 1574809200000.2), false)
+    assert.strictEqual(isTimestamp('dateCreated', 0), true)
+    assert.strictEqual(isTimestamp('updatedAt', 0), true)
+    assert.strictEqual(isTimestamp('deletedAt', 0), true)
+    assert.strictEqual(isTimestamp('DATE', 0), true)
+    assert.strictEqual(isTimestamp('TIMESTAMP', 0), true)
+    assert.strictEqual(isTimestamp('timestamp', 0), true)
+    assert.strictEqual(isTimestamp('hello', 0), false)
+    assert.strictEqual(isTimestamp('TIM', 0), false)
   })
 
   // TODO: thoroughly test all util methods