What is the best way to track expiry dates?

The best way to track expiry dates is a single dated register with automated, escalating reminders — the tool matters less than those three properties: everything in one place, every item owned by someone, every reminder fired at realistic lead time.

Honest tiering by scale: a handful of personal dates? Your phone calendar is fine. A dozen business dates and one owner? A disciplined spreadsheet works — until the owner is on holiday when something lapses, or a date gets typo'd and nobody notices. Multiple people, entities, documents and consequences? That's when a dedicated tracker earns its keep: reminders that repeat and escalate (email → Slack → SMS), items with owners and attached documents, and dates visible to the team rather than one person's memory.

Whichever tier you're at: capture dates the day they enter the business, and put reminders at lead time, not deadline day.