Date & Time Toolkit
Exact age, date difference, Unix timestamps, timezone conversion, and working-day counts — all in your browser.
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Timezone Converter
Convert one civil date and time across IANA zones, with UTC offsets and a DST-change hint — privately in your browser.
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Working Days Calculator
Count weekdays between two dates, skip custom holidays, or add working days. Saturday–Sunday, Friday–Saturday, and Sunday-only weekends.
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Unix Timestamp Converter
Convert Unix seconds and milliseconds to UTC, local, and IANA time zones — plus ISO-8601, RFC 2822, and relative time. Runs in your browser.
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Age Calculator
Calculate exact age in years, months, and days from a birth date — leap-year aware.
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Date Difference Calculator
Calculate days between two dates with a years, months, and days breakdown.