Daylight Savings Time is a popular concept all over the world. Unfortunately, it has yet to become a fixed standard; many countries or regions are still experimenting with the idea so time zones change from year to year. There is no universal period of application either, so a means of entering the applicable dates and deviations for each country is necessary. This program handles that function.
For each country, indicated by the appropriate ICAO country code, the program will store, for each standard time zone, the applicable DST deviation from GMT and the active dates for two DST periods; a current period and a future period. The program automatically checks on a weekly basis to see if any of the current periods are expired. If they are, then the future period overwrites the current period and the records of all airports affected are updated accordingly, with a hardcopy listing being automatically generated to the system printer.
The modes available are:
Once you have confirmed your entries, the program will check all airport files that may be affected and amend whatever records need to be updated.
Enter the country code for the country you want to edit. The program will recall and display the zone with the least deviation.
Under normal circumstances, an expired DST period will not exist on the system because of the weekly chronological test for period validity; all expired periods are automatically removed from the system and over-written by the future period information, if it exists.
If you edit the current period, or add a new current period where none exists, the program will immediately update all applicable airport records and print a list of all such airports. A future period can only be added if a valid current period exists.
Once a record has been edited the program will automatically call up the next standard deviation zone for the selected country being edited.
Enter the ICAO country code and standard deviation of the record you want to delete. Before the program will delete an entry, it checks to see if any airports are going to be affected. If so, a report is generated and deletion will not take place until each such airport has been edited.
When you enter a country code in the Video mode, the program automatically calls up and displays the record for the first standard deviation zone on file for the country. You may then filter through all of the zones available for the given country, as well as any preceding or subsequent record. by using the down arrow or the up arrow as the case may be. Pressing <Enter> will clear the screen; pressing <Enter> a second time will return you to the command line.
When the Screen mode is selected you will be presented with a range selection screen which will permit you to enter the range of country codes you want to review; the default values are A and Z. For each country code, the country name, standard time zones, their DST deviations. and current and future active periods are displayed.
The Hardcopy mode will produce the same reports as the Screen mode except that the output will be sent to the system printer.
Entering <Q> from the command line will immediately return you to the previous program selection menu.
Note: The following descriptions represent the typical access and privileges afforded to users designated as Dispatch Managers/Supervisors. Users with dispatcher privileges will have limited access to a subset of the screens presented.