2027 schedule
| Change | Date | Local time | What happens |
|---|---|---|---|
| Clocks go forward | Sunday, March 28, 2027 | 3:00 AM | Jumps to 4:00 AM — one hour is lost |
| Clocks go back | Sunday, October 31, 2027 | 4:00 AM | Returns to 3:00 AM — one hour is gained |
Bulgaria keeps EET in winter and shifts one hour forward for the summer.
Time until the next change
Current local time:
Health Considerations for Bulgaria Residents
The spring transition is the one that hurts. A study in Open Heart found the risk of heart attack rose by about 24% on the Monday after clocks went forward, before falling back to normal within the week. Research published in Current Biology found a 6% rise in fatal traffic accidents in the week following the spring change, with the effect strongest in the morning and in the western parts of time zones.
The autumn change, when most people gain an hour, shows no comparable spike. Researchers attribute the difference to sleep loss rather than to the clock change itself.
Does DST Actually Save Energy?
This was the original justification, and it is the claim that has held up worst. A US Department of Energy report to Congress in 2008 measured the four weeks added to DST in 2007 and found a saving of about 0.5% of daily national electricity use — real, but small.
Other work has found no saving at all. A well-known study of Indiana, which adopted DST statewide in 2006, found residential electricity use actually rose by 1–4%: households used less lighting but more air conditioning on hot summer evenings. Any lighting savings are also partly offset by extra petrol use as people travel more in the lighter evenings.
Technology and Time Changes in 2027
Phones, computers and anything else that syncs with an internet time server handle the transition on their own. What still catches people out in Bulgaria is the long tail of devices that don't: car dashboards, ovens and microwaves, wall clocks, older thermostats, and cheap alarm clocks with a DST setting hard-coded to a schedule that has since changed.
For anyone running servers, the transitions are a recurring source of bugs — duplicated or missing local timestamps around the changeover, cron jobs that fire twice or not at all, and stale operating system timezone databases. Storing timestamps in UTC and keeping the tzdata package current avoids almost all of it.
Getting ready
- Set your clocks before going to bed to avoid confusion in the morning.
- Use the phrase 'Spring forward, fall back' to remember which direction to change your clocks.
- Check and replace smoke detector batteries when changing clocks - it's a good reminder!
- Take advantage of the 'extra' hour in fall to catch up on sleep or tackle a project.
Frequently asked questions
When do the clocks change in Bulgaria in 2027?
Clocks go forward on Sunday, March 28, 2027 and back on Sunday, October 31, 2027.
Which way do the clocks go?
"Spring forward, fall back" is the usual mnemonic: forward one hour in spring, back one hour in autumn.
Do I have to change anything myself?
Phones, computers and anything that syncs over the internet update on their own. Car clocks, ovens, microwaves and older wall clocks generally do not.
Is Daylight Saving Time being scrapped?
It has been proposed in many places and adopted in few. The European Parliament voted in 2019 to end mandatory clock changes and the change has stalled; in the United States the Sunshine Protection Act has repeatedly passed the Senate without becoming law. Most of the world that changes its clocks is still changing them.