Added IntlTimeZone::fromDateTimeZone() and ::toDateTimeZone.

IntlTimeZone::fromDateTimeZone(DateTimeZone $dtz) converts from an
ext/date TimeZone to an IntlTimeZone. The conversion is done by feeding
the time zone name (essentially what would be given by
DateTimeZone::getName()) to ICU's TimeZone::createTimeZone except if it's
an offset time zone. In that case, the offset is read from the ext/date
time zone object structure and an appopriate id (of the form
GMT<+|-><HH:MM>) is given to ICU's TimeZone::createTimeZone. Not all
ext/date time zones are recognized for ICU. For instance, WEST is not.
Note that these kind of abbreviations, as far as I can tell, can only be
created via ext/date DateTime, not directly through DateTimeZone's
constructor.

For IntlTimeZone::toDateTimeZone(), the behavior is symmetrical.
We instantiate a DateTimeZone and then call its constructor if we don't
have an offset time zone, otherwise we mess with its structure. If the
timezone is not valid for ext/date, then we allow the exception of
DateTimeZone constructor to propagate.

1 files changed, 4 insertions, 0 deletions

diff --git a/ext/intl/timezone/timezone_methods.h b/ext/intl/timezone/timezone_methods.h
index 207caa3cb0..824f72a0d2 100644
--- a/ext/intl/timezone/timezone_methods.h
+++ b/ext/intl/timezone/timezone_methods.h
@@ -21,6 +21,8 @@
 
 PHP_FUNCTION(intltz_create_time_zone);
 
+PHP_FUNCTION(intltz_from_date_time_zone);
+
 PHP_FUNCTION(intltz_create_default);
 
 PHP_FUNCTION(intltz_get_id);
@@ -55,6 +57,8 @@ PHP_FUNCTION(intltz_get_display_name);
 
 PHP_FUNCTION(intltz_get_dst_savings);
 
+PHP_FUNCTION(intltz_to_date_time_zone);
+
 PHP_FUNCTION(intltz_get_error_code);
 
 PHP_FUNCTION(intltz_get_error_message);