Tip o' the Week 419 – What's the time?

The subject of time has featured on a few occasions on ToW – #301, #314, #325, #388 … but there’s always more scope to talk about it. Windows 10 tweaked the way time is presented, from showing the calendar and the agenda (sourced from whatever is synced into the Calendar app), to the Alarms & Clocks app which offers visual wakeup alarms, daylight maps, and timer/stopwatch apps. In the Windows Insiders builds of the last few weeks – currently 17101 (which is now in the Fast Ring) , there have been changes that bring the clock further forward too – the Game Bar has been updated to include the clock on the left of the bar, for one thing. What is time? Existentially, time is relative. If you ever find that your Windows PC isn’t keeping time accurately, you may want to check that you have it set to get its time automatically (check Settings -> Time & Language - > Date & time) , or go into the old-fashioned Control Panel, search for time and look at the settings in there, especially under the “Internet Time” tab to see where it’s syncing the time from: time.windows.com is probably the default. Windows Time is also a thing – the number of milliseconds since the machine was started up, and also the name of the service that controls the time synchronisation. Unix time is also a concept, measuring the number of elapsed seconds since 1st January 1970, and may present another millennium bug style problem in 20 years, if anyone is still using 32-bit *nix by then. Back to simple relativity, though – what is the actual, real “time”? If you have multiple clocks, watches, phones & PCs, it’s a fair bet that they’ll all be divergent, unless they’re all being synchronised by some external device (your broadband router, maybe) . If you’d like to find out exactly what the time is and don’t have access to an atomic clock or similar, there are a few online resources that might help…  and you could even try asking Cortana, as she knows about time zones and stuff. But the best time site is https://time.is . Try it from any device and you’ll get the time right now;  some allowances need to be made for network latency but the operators have tried their best. It tells you the time in your location (or one of your choice) , and calculates the offset between your computer’s clock and the time.is service. For an illustration of what latency (as ultimately governed by the speed of light) means when accessing nearby vs far away websites, check out www.azurespeed.com, which measures the time to connect to storage services at Azure datacenters. Some variance could be explained by performance spikes and so on, but the main impact is network latency due to distance travelled. The results can sometimes be surprising.