Precision Expiry: Optimizing Plan Expiry for Seamless Subscription Management

## The Edge Cases of Time Handling subscription expiration logic is notoriously tricky. When a plan expires "on the 15th", what timezone does that rely on? The user's browser? Your node backend? Standardized UTC? If your system grants access until 11:59 PM PST but the user runs on IST, you create massive desynchronizing flaws. ## Storing Time Correctly Always, consistently without fail, store Timestamps in UTC within your PostgreSQL schemas. `expires_at TIMESTAMPTZ NOT NULL` ### Access checks When checking if a user has access to a premium route, do not calculate complex date differences locally. Rely directly on UNIX epoch boundaries: `const isActive = Date.now() < new Date(user.expires_at).getTime();` ## Webhook Synchronization Payment gateways like Stripe heavily utilize webhook payloads triggering `customer.subscription.deleted`. Ensure your backend immediately processes these flags, rather than relying strictly on heavy internal cron workers to eventually sweep elapsed dates. Precision is profit.