Timestamps, cron, timezones and spans. All 6 tools below run locally in your browser — nothing is uploaded.
Time is the category where being slightly wrong is expensive. A timestamp read in the wrong unit, a cron expression that fires on the wrong day, a meeting scheduled across a DST boundary — each is a small misunderstanding with visible consequences.
These tools make the interpretation explicit: a Unix timestamp shown as ISO, UTC, local and relative at once; a cron expression explained in plain English with its next run times listed; timezones compared side by side so the offset is something you can see rather than compute.
Both at once, which is the point. A converted timestamp is shown as ISO 8601, UTC, your own local time and a relative span together, so there is no offset to hold in your head — and the Timezone tool sets several zones side by side when you need to compare them directly.
Paste it into the Cron Parser and it is translated into a sentence, with the next several run times listed so you can confirm the schedule is what you intended before deploying it.
Date Diff gives the exact span in days, and also breaks it into years, months and days — the form you want when it is an age or a contract term rather than a raw count.