PHP Timezones Functions

e

Timezone identifier (added in PHP 5.1.0)

I (capital i)

Whether or not the date is in daylight saving time

O

Whether or not the date is in daylight saving time

O

Difference to Greenwich time (GMT) in hours

P

Difference to Greenwich time (GMT) with colon between hours and minutes (added in PHP 5.1.3)

T

Timezone abbreviation

Z

Timezone offset in seconds. The offset for timezones west of UTC is always negative, and for those east of UTC is always positive.