Why Did My JellyFish Lighting Schedule Stop Running After Daylight Saving Time?
- Controller timezone was set correctly but DST auto-adjustment did not apply
- Schedules were created with absolute fixed times rather than sunrise/sunset triggers, which require manual update each season
- Controller lost its NTP (network time protocol) sync after DST and has an incorrect internal clock
Problem Description
After daylight saving time (DST) changes in spring or fall, JellyFish lighting schedules shift by one hour or stop triggering entirely because the controller's internal clock did not update correctly or the schedule references an absolute time that no longer matches the intended lighting window.
Symptoms
- Lights now turn on or off exactly one hour earlier or later than expected after DST change
- Lights stop coming on at dusk because the sunset time changed but the schedule was a fixed time
- Schedule that was set to 7:00pm now fires at 6:00pm or 8:00pm
- Sunrise/sunset schedules stopped triggering after the time change
- Controller shows the wrong current time on the front panel display
Recognize these? Here's what usually causes it.
Common Causes
- Controller timezone was set correctly but DST auto-adjustment did not apply
- Schedules were created with absolute fixed times rather than sunrise/sunset triggers, which require manual update each season
- Controller lost its NTP (network time protocol) sync after DST and has an incorrect internal clock
- App timezone on the phone changed but the controller was not updated to match
Most fixes happen in the first 3 steps.
JellyFish schedules use the controller's internal clock for local execution. If the controller is offline when DST occurs, it may not receive the time update and will continue using the old time until it reconnects and syncs with NTP.
Tools & Requirements
Step-by-Step Solution
Use Sunrise/Sunset Schedules for All Exterior Lighting
Fixed-time schedules require seasonal adjustment twice per year. Sunset/sunrise triggers are set-it-and-forget-it — the controller automatically calculates the correct trigger time based on your GPS location and the current date. This is the recommended schedule type for permanent outdoor lighting.
DST Happens Twice a Year
In the US: clocks spring forward 1 hour in March and fall back 1 hour in November. If your JellyFish schedules are fixed-time, add a calendar reminder to check and update them the Monday after each DST change.
Check All Zones Separately
If you have multiple zones with separate schedules, each zone schedule needs to be verified after a DST change. A schedule update on one zone does not automatically update other zones.
Quick Solutions
Still having issues? This is usually the deeper cause below.
Schedules that skip randomly are usually a daylight-saving holdover — delete and recreate the schedule to clear the corrupted entry.
Switching to sunrise/sunset triggers is a one-time setup that permanently eliminates DST-related schedule drift. Most JellyFish owners who make this change never experience a seasonal schedule issue again.
Thermostat issues that keep returning are often caused by stale backup-battery memory holding old settings across power cycles without the user realising.
- Controller timezone was set correctly but DST auto-adjustment did
- Schedules were created with absolute fixed times rather than
- Controller lost its NTP (network time protocol) sync
- App timezone on the phone changed but the controller
Before you go — try one of these (they fix most cases).
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Need More Help? JellyFish Lighting Support
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