ISO 8601 P format

The ISO 8601 P, or ISO 8601 duration, format is: PyearYmonthMweekWdayDThourHminuteMsecondS where the values  ,  , etc., are integer values  specifying a duration or an offset (delta) from the current time. The initial P is required; other fields may be omitted, though the T is required if any  time values are specified.

Note that all of the letters in ISO 8601 P values must be written in upper case.

For example,  means a one hour duration or offset.

Besides the  channel option and a few alias options, also several MeterMaid   options take ISO 8601 P arguments.

See also:
 * alias_deferred Option
 * alias_expiry Option
 * backoff Option
 * quota_time Option
 * inactivity_time Option
 * resubmit_time Option
 * block_time Option
 * Alias file named parameters
 * local_table
 * test -time utility
 * ISO 8601 format