$_timezone
$_timezone :
PHPExcel_Shared_TimeZone
getTimeZoneAdjustment(string $timezone, integer $timestamp) : integer
Return the Timezone offset used for date/time conversions to/from UST This requires both the timezone and the calculated date/time to allow for local DST
| string | $timezone | The timezone for finding the adjustment to UST | 
| integer | $timestamp | PHP date/time value | 
Number of seconds for timezone adjustment
_getTimezoneTransitions(\DateTimeZone $objTimezone, integer $timestamp) : array
Return the Timezone transition for the specified timezone and timestamp
| \DateTimeZone | $objTimezone | The timezone for finding the transitions | 
| integer | $timestamp | PHP date/time value for finding the current transition | 
The current transition details