diff --git a/src/__tests__/posthog-core.test.ts b/src/__tests__/posthog-core.test.ts
index cdbeba835..c60a699b9 100644
--- a/src/__tests__/posthog-core.test.ts
+++ b/src/__tests__/posthog-core.test.ts
@@ -35,6 +35,10 @@ describe('posthog core', () => {
         console.error = jest.fn()
     })
 
+    it('exposes the version', () => {
+        expect(defaultPostHog().version).toMatch(/\d+\.\d+\.\d+/)
+    })
+
     describe('capture()', () => {
         const eventName = 'custom_event'
         const eventProperties = {
diff --git a/src/posthog-core.ts b/src/posthog-core.ts
index 16f21e721..356457966 100644
--- a/src/posthog-core.ts
+++ b/src/posthog-core.ts
@@ -264,6 +264,7 @@ export class PostHog {
     __request_queue: QueuedRequestOptions[]
     decideEndpointWasHit: boolean
     analyticsDefaultEndpoint: string
+    version = Config.LIB_VERSION
 
     SentryIntegration: typeof SentryIntegration
     sentryIntegration: (options?: SentryIntegrationOptions) => ReturnType<typeof sentryIntegration>
@@ -863,7 +864,8 @@ export class PostHog {
         this.on('eventCaptured', (data) => callback(data.event, data))
     }
 
-    _calculate_event_properties(event_name: string, event_properties: Properties, timestamp: Date): Properties {
+    _calculate_event_properties(event_name: string, event_properties: Properties, timestamp?: Date): Properties {
+        timestamp = timestamp || new Date()
         if (!this.persistence || !this.sessionPersistence) {
             return event_properties
         }