set the timezone after transaction setup

lib/dialects/postgres/connector-manager.js

@@ -68,6 +68,10 @@ module.exports = (function() {
     }).run()
   }
 
+  ConnectorManager.prototype.afterTransactionSetup = function(callback) {
+    this.setTimezone(this.client, 'UTC', callback)
+  }
+
   ConnectorManager.prototype.connect = function(callback) {
     var self = this
     var emitter = new (require('events').EventEmitter)()
@@ -108,11 +112,17 @@ module.exports = (function() {
           }
         }
       } else if (client) {
-        client.query("SET TIME ZONE 'UTC'").on('end', function() {
+        var timezoneCallback = function() {
           self.isConnected = true
           self.client = client
           emitter.emit('success', done)
-        })
+        }
+
+        if (self.config.keepDefaultTimezone) {
+          Utils.tick(timezoneCallback)
+        } else {
+          self.setTimezone(client, 'UTC', timezoneCallback)
+        }
       } else {
         done && done()
         self.client = null
@@ -136,6 +146,10 @@ module.exports = (function() {
     return emitter
   }
 
+  ConnectorManager.prototype.setTimezone = function(client, timezone, callback) {
+    client.query("SET TIME ZONE '" + (timezone || "UTC") + "'").on('end', callback)
+  }
+
   ConnectorManager.prototype.disconnect = function() {
     if (this.poolIdentifier) {
       this.poolIdentifier.destroyAllNow()