Yellowknife, Northwest Territories, CANADA



Daylight savings time ends at 0200 hrs on Sunday, November 7, 2021.  One will need to set the clocks backwards 1 hour to 0100 hrs Sunday, November 7, 2021. 

We will go from Mountain Daylight Time (MDT) or UTC-6 to Mountain Standard Time (MST) or UTC-7. Of course if radio amateurs use UTC (or Zulu time) to record their contacts, the effect of this time change is meaningless.  Most phones and computers will automatically adjust.  Older equipment may not and may have to be set manually.  

There is a move in Western Canada to end these time changes.  The idea of daylight savings time is meaningful at temperate latitudes so as to adjust for the lengthening or shortening of days due to the axial tilt of the earth - the cause of the seasons.  But that effect has little meaning at higher latitudes and near the equator.  Sunrise and sunset at higher latitudes are so out of phase with standard working hours, the effect of time changes is irrelevant.  At equatorial latitudes, the difference between the length of day and night is negligible.