Comparing Dates

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The following basic operations do not have corresponding convenience methods for the date parts listed in Zend_Date API Overview.

Table 48. Date Comparison Methods

Method	Explanation
`equals()`	`equals($date, $part = null, $locale = null)` returns `TRUE`, if `$part` of `$date` having locale `$locale` is the same as this object's date `$part`, otherwise `FALSE`
`isEarlier()`	`isEarlier($date, $part = null, $locale = null)` returns `TRUE`, if `$part` of this object's date is earlier than `$part` of `$date` having a locale `$locale`
`isLater()`	`isLater($date, $part = null, $locale = null)` returns `TRUE`, if `$part` of this object's date is later than `$part` of `$date` having a locale `$locale`
`isToday()`	`isToday()` Tests if today's year, month, and day match this object's date value, using this object's timezone.
`isTomorrow()`	`isTomorrow()` Tests if tomorrow's year, month, and day match this object's date value, using this object's timezone.
`isYesterday()`	`isYesterday()` Tests if yesterday's year, month, and day match this object's date value, using this object's timezone.
`isLeapYear()`	`isLeapYear()` Use `isLeapYear()` to determine if the current object is a leap year, or use `Zend_Date::checkLeapYear($year)` to check `$year`, which can be a string, integer, or instance of `Zend_Date`. Is the year a leap year?
`isDate()`	`isDate($date, $format = null, $locale = null)` This method checks if a given date is a real date and returns `TRUE` if all checks are ok. It works like PHP's `checkdate()` function but can also check for localized month names and for dates extending the range of `checkdate()`