P2DT3H

P2DT3H is an ISO 8601 duration notation representing a time interval of two days and three hours. The format starts with the letter P to indicate a duration, followed by D for days (2D). A T separates any date-based components from time-based components, and the time portion includes H for hours (3H). The example contains no minutes or seconds, but additional components such as M (minutes) or S (seconds) could be appended after the H.

In total, P2DT3H equals 51 hours, 3060 minutes, or 183,600 seconds. It is equivalently expressed as PT51H in cases where a purely time-based representation is preferred, since that form omits the day component while preserving the same total duration.

Applications and compatibility: P2DT3H is widely used in data interchange and scheduling to convey durations in a machine-readable way. It appears in XML schemas, API payloads, calendar data, and other systems that implement ISO 8601 duration semantics. Most modern programming languages and libraries that support ISO 8601 durations can parse P2DT3H or convert it to native duration types, such as seconds or hours, depending on the language.

Notes on use: The canonical order for a duration is Y, M, D before the time separator T, and H, M, S after T. If there are no time components, the T and time portion can be omitted; if there are no date components, the duration may begin with PT. This notation avoids ambiguity when communicating lengths of time across different regions and systems.