Daylight Saving Adjustment



  • Hi,
    Daylight saving makes sunset an hour later.
    Does f.lux automatically adjust for daylight saving or is there a way to adjust it manually (other than changing my location to one that is an hour further east)?
    Many thanks.


  • f.lux team

    It should work! If it doesn't, please let us know.



  • I thought that f.lux just depended entirely on what your computer's current time is and compares that to what the current Sunrise and Sunset times are for the current date that your computer is set to.



  • @lorna
    Hi Lorna, Yes, it does work. It has changed the colouring about an hour later than it did last week just like it should. :-)
    Adam.



  • @TwoCables
    I may have misunderstood you, but if f.lux relied solely on the computer's current time and sunset time at my location there would be a problem - it needs to also take account of the timetable for daylight saving time around the world - which I can now see that it does for the UK, at least.



  • I am just saying that I don't really know how it works, but that's how I thought it worked. Judging from Lorna's reply, it's apparently not as simple as what I thought. I was hoping for Lorna to elaborate.



  • @TwoCables I know it works with location, and has data (most likely from google maps) on when sunset time and sunrise are in different locations. If way up north on Earth, the daylight will be much shorter, on the equator, it's about 12 hours even.



  • @Tungsten_smooth said:

    @TwoCables I know it works with location, and has data (most likely from google maps) on when sunset time and sunrise are in different locations. If way up north on Earth, the daylight will be much shorter, on the equator, it's about 12 hours even.

    I know, but if your computer's time and/or date are wrong, then that won't work.



  • @TwoCables Well yeah it also uses your computers clock. It doesn't synchronize to a time server. If your CMOS battery is dead, and your clock at 12 AM at night, then everything will be very dark, even during the day. So it uses both location to pull the amount of daylight / night, then uses the clock to know where to be.

    Off topic, go to your clock settings, what time server are you using? I stopped using time.windows.com because I think it's default and maybe overused, so I use the nist server.



  • Here's how I understand f.lux to work for this. I'm not declaring that this is how it works, I am saying that this is my current understanding and that I accept the possibility that it may be either partially incorrect or completely incorrect:

    • It uses your computer's current time and current date to know when sunrise and sunset will be (and/or when it was). The rest is pretty obvious, but this is how it knows whether to be in the 'Daytime' mode or in the 'At night' mode, and WHERE in that mode (again, how far away the next sunrise or sunset is).

    As I have demonstrated in the past, you can "fool" f.lux by simply changing your computer's time and date. Of course, that won't last forever because Windows is set to automatically synchronize with a time server, and you will also find that Windows Update will fail to function if your computer's date and time don't match the Windows Update server's date and time (within reason - it can be a few minutes off).

    So this is why I believe f.lux has no programming whatsoever for Daylight Savings Time. The only time and date that f.lux knows is what your computer is telling it. If I'm wrong, then I hope to be corrected.

    Off topic: I have a variety of local time servers that I rely on and I manually synchronize every single day before I do ANYTHING on my computer (I always turn my computer off when I'm not using it, so I turn it on when I wake up and the first thing I do is synchronize the time). Why are you asking?

    Amusing fact: I can update my computer's time with the time server in under 3 seconds, starting with nothing open. I've been doing it for so long that I can do the entire process from start to finish "in the blink of an eye". I sometimes end up doing it a second time a few minutes later because I don't remember doing it!



  • @TwoCables if you're shutting down the pc, it's nice to start fresh but you could put it in sleep mode and get it running faster if you're not using an ssd.



  • @TwoCables Why do you sync the time everyday? Do you work with applications that need very accurate time keeping?

    Thinking about it more, I should sync my time every night, so when I have something to work on that needs to be completed, I'll know I won't finish it too late.



  • @Tungsten_smooth said:

    @TwoCables if you're shutting down the pc, it's nice to start fresh but you could put it in sleep mode and get it running faster if you're not using an ssd.

    Thank you, but I have very good reasons for why I don't use sleep mode:

    1. My computer is in my bedroom
    2. In sleep mode, certain LEDs remain lit
    3. That's extremely annoying for me

    Ok? :)

    @Tungsten_smooth said:

    @TwoCables Why do you sync the time everyday? Do you work with applications that need very accurate time keeping?

    It's just because I'm an anal-retentive perfectionist. That's seriously the reason. There's more to it, but it's not important.

    @Tungsten_smooth said:

    Thinking about it more, I should sync my time every night, so when I have something to work on that needs to be completed, I'll know I won't finish it too late.

    If Windows is doing its job, then your clock will never be off by more than several seconds to as much as 1 minute.



  • @TwoCables Yeah but you know, when things come done to the wire, that "several seconds" may be EXTREMELY important...

    Also, you could just throw a dark shirt over the sides and back of the computer to block the LEDs from the GPU and network ports. I know because I leave my PC on at night, and well, I'm not going to restrict air flow with a shirt, it seems like a bad idea.



  • @Tungsten_smooth said:

    @TwoCables Yeah but you know, when things come done to the wire, that "several seconds" may be EXTREMELY important...

    Also, you could just throw a dark shirt over the sides and back of the computer to block the LEDs from the GPU and network ports. I know because I leave my PC on at night, and well, I'm not going to restrict air flow with a shirt, it seems like a bad idea.

    lol dude, I'm fine. Stop offering up unsolicited advice already. ;) It's kind of annoying.


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