This section explains how tim= ing is described in all of the configuration files.

All date/time durations in the config= uration files are specified as defined by ISO 8601.

Durations are represented by the form= at P[n]Y[n]M[n]DT[n]H[n]M[n]S. In these representations, the [n] is replace= d by the value for each of the date and time elements that follow the [n]. = Leading zeros are not required. The capital letters 'P', 'Y', 'M', 'D', 'T'= , 'H', 'M', and 'S' are designators for each of the date and time elements = and are not replaced.

- P is the duration designator (histor= ically called "period") placed at the start of the duration representation.=
- Y is the year designator that follow= s the value for the number of years.
- M is the month designator that follo= ws the value for the number of months.
- D is the day designator that follows= the value for the number of days.
- T is the time designator that p= recedes the time components of the representation.
- H is the hour designator that follow= s the value for the number of hours.
- M is the minute designator that foll= ows the value for the number of minutes.
- S is the second designator that foll= ows the value for the number of seconds.

For example, "P3Y6M4DT12H30M5S" repre= sents a duration of "three years, six months, four days, twelve hours, thir= ty minutes, and five seconds". Date and time elements including their desig= nator may be omitted if their value is zero, and lower order elements may a= lso be omitted for reduced precision. For example, "P23DT23H" and "P4Y" are= both acceptable duration representations.

**Exception:**

- One month is assumed to be 31 days.<= /span>
- One year is assumed to be 365 days.<= /span>