Change instanceof(Date) to util.types.isDate(Date)

packages/pg/lib/utils.js

@@ -4,6 +4,8 @@ const crypto = require('crypto')
 
 const defaults = require('./defaults')
 
+const util = require('util')
+
 function escapeElement(elementRepresentation) {
   var escaped = elementRepresentation.replace(/\\/g, '\\\\').replace(/"/g, '\\"')
 
@@ -52,7 +54,7 @@ var prepareValue = function (val, seen) {
     }
     return buf.slice(val.byteOffset, val.byteOffset + val.byteLength) // Node.js v4 does not support those Buffer.from params
   }
-  if (val instanceof Date) {
+  if (val instanceof Date || util.types.isDate(val)) {
     if (defaults.parseInputDatesAsUTC) {
       return dateToStringUTC(val)
     } else {

packages/pg/test/integration/gh-issues/2862-tests.js

@@ -0,0 +1,27 @@
+'use strict'
+var helper = require('./../test-helper')
+var assert = require('assert')
+var util = require('util')
+var vm = require('vm');
+
+const suite = new helper.Suite()
+
+suite.test('Handle date objects as Date', async (done) => {
+  const date = new Date();
+  const dateObj = await vm.runInNewContext('new Date()');
+  assert(!(dateObj instanceof Date))
+  assert(util.types.isDate(dateObj))
+  const client = new helper.pg.Client()
+  client.connect()
+
+  await client.query('CREATE TEMP TABLE foo(bar TIMESTAMP, bar2 TIMESTAMP)')
+  await client.query('INSERT INTO foo(bar, bar2) VALUES($1, $2)', [date, dateObj])
+  const results = await client.query('SELECT * FROM foo')
+  const row = results.rows[0]
+  const dbDate = row.bar
+  const dbDateObj = row.bar2
+  assert.deepEqual(dbDate, date)
+  assert.deepEqual(dbDateObj, dateObj)
+  await client.end()
+  done()
+})