We change the clocks mainly because of daylight saving time, which was introduced to make better use of daylight in the summer and, historically, to save energy.

What daylight saving time is

  • Daylight saving time (DST) is when clocks are moved forward by one hour in spring and back by one hour in autumn.
  • The idea is to “shift” human activity so more of it happens while the sun is up, especially in the evening.

Why it started

  • Early proposals in the late 19th and early 20th centuries argued people were “wasting” early-morning light by sleeping through it in summer.
  • Governments later adopted clock changes widely to reduce artificial lighting needs and save fuel and electricity, especially around wartime and energy‑scarce periods.

Why we still do it

  • Supporters say changing clocks means:
    • Brighter evenings for leisure and shopping.
    • Potential energy savings, since people need lights a bit less in the early evening.
    • Possible boosts to mood and outdoor activity in lighter evenings.
  • Some countries and regions are now debating or passing laws to make a single time (often permanent DST or permanent standard time) and stop the twice‑yearly change.

Why many people dislike it

  • Sleep and health researchers point out that clock changes briefly “jet lag” people, disrupting sleep and body clocks and possibly harming health.
  • Critics also argue that modern energy use patterns (like air conditioning and electronics) mean the energy savings are small or uncertain, so the hassle is not worth it.

Forum and “latest news” angle

  • Online forum discussions about “why do we change the clocks” often feature:
    • People who want permanent summer-like time for lighter evenings.
    • Others who hate dark winter mornings under permanent DST and prefer standard time.
  • In recent years, several countries and regions have debated or attempted reforms, so the question “why do we change the clocks” keeps trending every spring and autumn as clock‑change weekends approach.

TL;DR: We change the clocks because of daylight saving time, an old idea meant to use daylight better and save energy, but today people are divided over whether the benefits still outweigh the health and practical downsides.

Information gathered from public forums or data available on the internet and portrayed here.