Use this converter when the source value, representation, or measurement unit is known and you need the equivalent value in a supported target form without changing its underlying meaning.

Date

Calendar date in YYYY-MM-DD format, interpreted in UTC.

Time

UTC time of day in HH:MM:SS format.

Convert a calendar date and optional UTC time into a Unix timestamp. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Unix seconds

Whole seconds since the Unix epoch.

Unix milliseconds

Milliseconds since the Unix epoch.

• A conversion is only valid when the input convention is identified correctly. Unit systems, character encodings, byte order, color profiles, reference conditions, rounding, and calendar or time-zone rules can make superficially similar values non-equivalent.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Keep the original value and its unit or encoding alongside the result. For interchange, also validate the output against the receiving format, standard, color profile, or reference conditions.

• Unix Timestamp to Date Converter

  Convert whole Unix seconds into a UTC calendar date, clock time and ISO 8601 string.

• Time Zone Converter

  Convert a dated local time from an IANA zone, common abbreviation, city, or UTC offset to every runtime-supported IANA time zone.

• Convert Frequency

  Convert periodic frequency between hertz, SI multiples, cycles per minute, and revolutions per unit time.