Seconds to HH:MM:SS
Convert raw seconds into clock, day-clock, ISO-8601, or words format with optional fractional-second precision.
About this tool
Convert a raw seconds value into common duration formats for video timestamps, logs, telemetry, schedules, and API payloads.
Supported formats:
hms—HH:MM:SS, with hours accumulating past 24 (90061→25:01:01)dhms—D:HH:MM:SS(90061→1:01:01:01)auto— shortest clock form (MM:SS,HH:MM:SS, orD:HH:MM:SS)iso— ISO-8601 duration (P1DT1H1M1S)words— human-readable text (1 day, 1 hour, 1 minute, 1 second)
Seconds may be fractional or negative. Use the fractional digits field to retain decimal seconds after rounding. All conversion happens locally in your browser.
FAQ
What happens when the duration is longer than 24 hours?
Depends on the format. hms lets the hours field grow past 24 — 90061 seconds
becomes 25:01:01 — which is what video editors and log tools usually expect.
If you'd rather see days split out, use dhms (1:01:01:01) or auto, which
picks the shortest sensible clock form.
How do I keep fractional seconds like 90.5?
Set the fractional digits field to 1–9. With decimals=1, 90.5 renders as
00:01:30.5; with the default of 0 the value is rounded to whole seconds. The
setting applies to every output format, including ISO durations.
Are negative durations supported?
Yes — a negative input is formatted like its positive counterpart with a leading
-, so -3661 in hms gives -01:01:01. Handy for countdowns and clock-drift
deltas.
What does the ISO format output for zero?
PT0S — the canonical ISO-8601 rendering of a zero-length duration. Non-zero
values only include the units they need, e.g. 90061 → P1DT1H1M1S.
Developer & Automation Access
Run it from the terminal
Same engine as this page, headless — via the gizza CLI:
gizza tool seconds-to-hms "5025"New to the CLI? Get gizza →
Open it by URL
Pre-fill and auto-run this tool with query parameters — the names match the API/CLI:
https://gizza.ai/tools/seconds-to-hms/?seconds=5025&format=hms&decimals=0Machine-readable descriptor: tool.json — title + parameters JSON Schema for agents.