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  • UNIX Timestamp

    All dates and times, even ambiguous ones (e.g. no year), are represented internally as absolute moments in time, represented as a UNIX timestamp expressing the difference between the desired time and January 1st, 1970 00:00:00 GMT. This was only possible, because Zend_Date is not limited to UNIX timestamps nor integer values. The BCMath extension is required to support extremely large dates outside of the range Fri, 13 Dec 1901 20:45:54 GMT to Tue, 19 Jan 2038 03:14:07 GMT. Additional, tiny math errors may arise due to the inherent limitations of float data types and rounding, unless using the BCMath extension.

  • Date parts as timestamp offsets

    Thus, an instance object representing three hours would be expressed as three hours after January 1st, 1970 00:00:00 GMT -i.e. 0 + 3 * 60 * 60 = 10800.

  • PHP functions

    Where possible, Zend_Date usually uses PHP functions to improve performance.

Zend Framework