- MFH: Fixed bug #45545 (DateInterval has a limitation of 4 chars for ISO
durations).

- MFH: Added support for using ISO 8601 time intervals to define a DatePeriod
iterator.
#- @doc

- Added new date/time functionality:
. support for diffing date/times through date_diff() / DateTime::diff().
. added DateInterval class to represent the difference between two date/times

- Added new date/time functionality:
. support for diffing date/times through date_diff() / DateTime::diff().
. added DateInterval class to represent the difference between two date/times.
. support for parsing ISO intervals for use with DateInterval.
. date_add() / DateTime::add(), date_sub() / DateTime::sub() for applying an
interval to an existing date/time.
- MFH: Fixed bug #44742 (timezone_offset_get() causes segmentation faults).

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