Zend_Date offers the following features, which extend the scope
of PHP date functions:
Zend_Dateoffers a very simple API, which combines the best of date and time functionality from four programming languages. It is possible, for example, to add or compare two times within a single row.
All full and abbreviated names of months and weekdays are supported for more than 130 languages. Methods support both input and the output of dates using the localized names of months and weekdays, in the conventional format associated with each locale.
Although PHP 5.2 docs state, "The valid range of a timestamp is typically from Fri, 13 Dec 1901 20:45:54 GMT to Tue, 19 Jan 2038 03:14:07 GMT,"
Zend_Datesupports a nearly unlimited range, with the help of the BCMath extension. If BCMath is not available, then
Zend_Datewill have reduced support only for timestamps within the range of the float type supported by your server. "The size of a float is platform-dependent, although a maximum of ~1.8e308 with a precision of roughly 14 decimal digits is a common value (that's 64 bit IEEE format)." [ http://www.php.net/float ]. Additionally, inherent limitations of float data types, and rounding error of float numbers may introduce errors into calculations. To avoid these problems, Zend Framework's I18n components use BCMath extension, if available.
Support for ISO-8601 date specifications
ISO-8601 date specifications are supported. Even partially compliant ISO-8601 date specifications will be identified. These date formats are particularly useful when working with databases. for example, even though MsSQL and MySQL differ a little from each other, both are supported by
Zend_Dateusing the Zend_Date::ISO_8601 format specification constant. When date strings conform to "Y/m/d" or "Y-m-d H:i:s", according to PHP
date()format tokens, use
Zend_Date's built-in support for ISO-8601 formatted dates.
Calculate sunrise and sunset
For any place and day, the times for sunrise and sunset can be displayed, so that you won't miss a single daylight second for working on your favorite PHP project :)