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A feature of FACTS is its ability to switch between summer and winter time. It can alter none, some or all of the following automatically: * TZ env-var * System time * BattClock time It can also indirectly modify other programs, if any of the following is true: * The program checks the TZ env-var for DST (this is what FACTS does) * The program supports SummertimeGuard (only if STG emulation is on) * The program directly supports Facts DST env-var (eg. newer versions of YAM) However, what the author of STG doesn't tell you, is that if you stop using it, YAM (and any other program which supports it) will still think you are using it. FACTS actually suffers from the same fate. However, if you DISABLE the emulation, it will delete the appropriate files and YAM will let you change the setting manually again. It is important to always DISABLE STG emulation if you stop using FACTS or only use it from the command line (running FACTS from the CLI never emulates STG) Please note that the file written by FACTS may not be exactly the same as one written from STG. FACTS also writes a country code of "NT" (for "Network Time", nothing to do with a version of the "popular" OS), which can potentially confuse some programs. Also note that FACTS never reads the file, and you can't use STG to change the DST state, and expect FACTS to pick up on this and correct the TZ env-var. (why would you want to run STG AND FACTS at the same time anyway?) The following countries are supported by AutoDST: Australia (Sydney/Melbourne) DST Starts: Last Sunday in October, at 2:00 DST Ends: Last Sunday in March, at 2:00 Tasmania/New South Wales DST Starts: First Sunday in October, at 2:00 DST Ends: Last Sunday in March, at 2:00 Azerbaijan DST Starts: Last Sunday in March, at 1:00 DST Ends: Last Sunday in October, at 1:00 Brazil DST Starts: Second Sunday in October, at 0:00 DST Ends: Third Sunday in February, at 0:00 Canada/Thule/Newfoundland/Mexico/Bahamas DST Starts: First Sunday in April, at 2:00 DST Ends: Last Sunday in October, at 2:00 Chile DST Starts: Second Sunday in October, at 0:00 DST Ends: Second Sunday in March, at 0:00 Cuba/Turks/Caicos DST Starts: First Sunday in April, at 0:00 DST Ends: Last Sunday in October, at 0:00 Egypt DST Starts: Fourth Saturday in April, at 0:00 DST Ends: Last Friday in September, at 23:00 Europe DST Starts: Last Sunday in March, at 2:00 DST Ends: Last Sunday in October, at 3:00 Falklands DST Starts: Second Sunday in September, at 0:00 DST Ends: Third Sunday in April, at 0:00 Fiji DST Starts: First Sunday in November, at 2:00 DST Ends: Last Sunday in February, at 3:00 Jordan DST Starts: First Saturday in April, at 0:00 DST Ends: Third Saturday in September, at 0:00 Lebanon/Mongol DST Starts: Last Sunday in March, at 0:00 DST Ends: Last Sunday in September, at 0:00 New Zealand DST Starts: First Sunday in October, at 2:00 DST Ends: Third Sunday in March, at 2:00 Paraguay DST Starts: First Sunday in October, at 0:00 DST Ends: Last Sunday in February, at 0:00 Russia/Asia/Kirgizstan DST Starts: Last Sunday in March, at 2:00 DST Ends: Last Sunday in October, at 2:00 United Kingdom DST Starts: Last Sunday in March, at 1:00 DST Ends: Last Sunday in October, at 2:00 United States of America DST Starts: First Sunday in April, at 2:00 DST Ends: Last Sunday in October, at 2:00 Zion DST Starts: First Saturday in April, at 2:00 DST Ends: First Saturday in Septemeber, at 2:00 Custom Uses the settings specified in tooltypes or TZ Note that half-hour adjustments/time checks, and absolute dates, are not currently supported. DST rules which use a different calendar will probably never be supported. If your country isn't here, or the above is wrong, please send me the information required. Please note that FACTS checks for DST on startup, and will switch between DST and normal time while it is left running.