teidata.duration.iso

A duration is expressed as a sequence of number-letter pairs, preceded by the letter P; the letter gives the unit and may be Y (year), M (month), D (day), H (hour), M (minute), or S (second), in that order. The numbers are all unsigned integers, except for the last, which may have a decimal component (using either

.

or

,

as the decimal point; the latter is preferred). If any number is 0, then that number-letter pair may be omitted. If any of the H (hour), M (minute), or S (second) number-letter pairs are present, then the separator

T

must precede the first time number-letter pair.

For complete details, see ISO 8601 Data elements and interchange formats — Information interchange — Representation of dates and times.