What does the T in PT1H30M mean?

It separates date units from time units. P1M is one month; PT1M is one minute. The T is required before any hours, minutes or seconds.

How are months and years converted?

ISO 8601 leaves their exact length to context; this tool uses the common conventions of 30-day months and 365-day years and notes when they're in play.

ISO 8601 Duration Converter

PT1H30M, decoded and generated.

ISO 8601 duratione.g. PT1H30M, P1DT2H, P2W

Plain duration

1 d 2 h 30 min 0 s

95,400 seconds

ISO 8601

P1DT2H30M

Seconds

95,400

hh:mm:ss

26:30:00

PT1H30M is ISO 8601 for “one hour thirty minutes” — the duration syntax used by YouTube's API, schema.org markup, and countless REST payloads. Paste one to decode it, or enter plain time to generate the ISO string.

How to use it

1.Paste an ISO 8601 duration (P1DT2H30M) to decode it.
2.Or type a plain duration (1d 2h 30m) to encode it.
3.Copy either representation.

Questions people ask

What does the T in PT1H30M mean?: It separates date units from time units. P1M is one month; PT1M is one minute. The T is required before any hours, minutes or seconds.
How are months and years converted?: ISO 8601 leaves their exact length to context; this tool uses the common conventions of 30-day months and 365-day years and notes when they're in play.

More developer & systems tools

Duration → Milliseconds Parser“1h 30m” to ms, seconds, and minutes.Unix Epoch Interval CalculatorThe exact span between two timestamps.Time Expression CalculatorAdd and subtract durations like a calculator.Cron Expression BuilderPoint, click, get the crontab line.Military Time Converter0800 to 8:00 AM, both directions.