Time Tools

Align dates across systems

Convert named time zones with an explicit daylight saving choice, or inspect an epoch timestamp with the correct unit. Calendar date differences are separate from elapsed hours.

• Time Zone Converter — Convert between IANA zones with explicit DST handling.
• Unix Timestamp Converter — Convert epoch timestamps to dates and dates to timestamps.
• Date Calculator — Compare dates and add or subtract calendar intervals.

Convert log batches and reporting calendars

Convert lists of epoch or ISO timestamps with per-row errors, then check ISO week-year boundaries or count working dates with a holiday policy you supply.

• Batch Timestamp Converter — Convert timestamp lists with nanosecond precision and row errors.
• ISO Week Converter — Convert dates and ISO week numbers across year boundaries.
• Business Days Calculator — Count working days with custom weekends and holiday exclusions.

Prepare timeout and TTL values

Convert fixed ISO durations, seconds and milliseconds using exact nanosecond arithmetic. Use a calendar date when adding months or years instead of assuming a fixed length.

• Duration Converter — Convert ISO durations and fixed time units to nanoseconds.
• Date Calculator — Compare dates and add or subtract calendar intervals.

A timestamp has a unit; a displayed date has a time zone

Unix time identifies an instant relative to the epoch. Seconds, milliseconds, microseconds and nanoseconds use different scales. Automatic detection is a convenience for common present-day values; override it when working with historical dates or values close to the epoch.

Keep nanosecond values as strings or BigInt

JavaScript Number cannot represent every 19-digit nanosecond timestamp exactly. The converter handles integer microsecond and nanosecond input before reducing it to Date’s millisecond precision. The displayed date therefore does not preserve sub-millisecond detail.