Maintaining date and time with time zone rule changes

A method in a computing device for maintaining date and time information, the method comprising:

• providing an indication of a first time zone;
• providing rules for converting dates and times between the first time zone and a second time zone;
• receiving a date and time in the first time zone;
• converting by the computing device the received date and time in the first time zone to a date and time in the second time zone based on a provided rule for the converting;
• and
• storing the converted date and time along with an indication of the rule used to convert the date and time from the first time zone to the second time zone.

A computer-readable storage device containing computer-executable instructions for controlling a computing device to maintain date and time information, the instructions implementing a method comprising:

• providing a plurality of rules for converting dates and times from various time zones to a common time zone, each rule having a unique identifier;
• converting a date and time in a designated time zone to a date and time in the common time zone using one of the plurality of rules;
• and
• storing the converted date and time along with the unique identifier of the rule used to convert the date and time in the designated time zone to the date and time in the common time zone.

A computing device for maintaining date and time information, comprising:

• a data store having an indication of a designated time zone and rules for converting a date and time between a first time zone and a second time zone;
• a memory storing computer-executable instructions of:
• a component that converts a date and time input in the first time zone to a date and time in the second time zone based on the provided rules;
• a component that stores the converted date and time along with an indication of the rule used to convert the date and time between the first time zone and the second time zone;
• and
• a component that receives an indication of an overriding rule that overrides the rule used to convert the date and time between the first time zone and the second time zone and that updates the stored date and time based on the overriding rule and stores an indication of the overriding rule along with the updated date and time;
• and
• a processor that executes the computer-executable instructions stored in the memory.