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Dates, Timestamps, and Time Zones

Last updated: 27 September 2026

Dates, durations, timestamps, time zones, age calculations, stopwatches, and ETA estimates.

This guide is the canonical guide page for related tools on ilham.dev. It should grow into practical explanations, caveats, examples, and references instead of creating one thin article per utility.

  • Age Calculator — Work out an age in years, months and days, with totals and the next birthday.
  • Chronometer — A simple stopwatch with laps.
  • Date Calculator — Add or subtract days, weeks, months and years, or measure the duration and business days between two dates.
  • ETA Calculator — Estimate a finish time from progress, elapsed time and remaining work.
  • Percentage Calculator — Work out percentages, increases and decreases.
  • Time Zone Converter — Read a timestamp from a log and see the same moment in UTC, Jakarta and other zones.
  • Timestamp Converter — Convert between Unix timestamps, ISO strings and local time.
  • User Agent Parser — Read the browser, engine, OS and device from a user-agent string.

Notes for future edits

  • Keep the guide reusable and factual.
  • Link to personal posts only when there is a real incident, measurement, migration, or lesson.
  • For sensitive inputs, mention whether the related tool runs locally in the browser and warn against pasting production secrets without understanding the trust boundary.