Abstract: Methods and apparatus, including computer program products, implementing techniques for testing user interfaces of software application. The techniques include interacting with a user to identify one or more straight lines in a first rendering of a user interface for a software application, the straight lines being diagnostic of the correct layout of the first rendering of the user interface, and using the one or more straight lines as reference lines to determine if a second rendering of the user interface has a correct layout.

Abstract: A time zone identifier for a geographic location is generated by receiving a request, including a first information portion in the time zone identifier that represents a time difference between a standard time and a local base time for the geographic location, and, if there exists a rule specifying when the geographic location observes daylight saving time, including a second information portion identifying the rule in the time zone identifier. Otherwise, the second information portion is not included. A computer-readable data structure for a time zone identifier includes a first attribute for the first information portion and a second attribute for the second information portion. A computer system includes a rule repository and a time zone management module.

Abstract: Methods and apparatus, including computer program products, implementing techniques for testing user interfaces of software application. The techniques include interacting with a user to identify one or more straight lines in a first rendering of a user interface for a software application, the straight lines being diagnostic of the correct layout of the first rendering of the user interface, and using the one or more straight lines as reference lines to determine if a second rendering of the user interface has a correct layout.