Time zone
CLST
Chile Summer Time
Chile Summer Time (CLST) covers Santiago and is anchored by UTC-04:00 as its standard offset, swinging forward a full hour during summer to give evenings extra daylight ahead of the next DST transition.
Friday, June 12, 2026
Current offset
UTC-04:00
Standard · -04
Daylight saving
Not observed
Year-round standard time
IANA zones
0
None observe daylight saving
DST offset
—
No summer variant
About CLST
A fixed, year-round offset.
Chile Summer Time (CLST) covers Santiago and is anchored by UTC-04:00 as its standard offset, swinging forward a full hour during summer to give evenings extra daylight ahead of the next DST transition.
Same offset · UTC-04:00
Other zones at UTC-04:00 right now.
These named zones share CLST's offset today. When daylight saving rules differ, they drift apart for part of the year.
Convert
CLST to the world's clocks.
Frequently asked questions
Common questions about CLST, daylight saving, and how to handle it in software. Can't find what you need? Email [email protected].
- What does CLST stand for?
- CLST is the abbreviation for Chile Summer Time, the UTC+03:00 advanced offset Santiago uses during daylight saving to extend evening daylight.
- Is Santiago currently observing CLST?
- No, the representative zone America/Santiago is running at its standard UTC-04:00 offset; the summer forward shift has not yet taken effect this year.
- When does Santiago expect its next clock change?
- The upcoming daylight-saving switch is scheduled for 6 September 2026 at 01:00 local time, when clocks will move forward to CLST.
- How often does Santiago move between offsets?
- Santiago toggles once annually, stepping from its standard UTC-04:00 to the summer CLST offset as set by Chilean national decree.
- Is the CLST schedule likely to change?
- Chile has modified its daylight-saving rules in recent years, so public announcements may shift the exact dates or abolish the practice altogether.
- How does CLST affect global coordination?
- Because Santiago lags much of Europe and North America by several hours during CLST, cross-continental calls and releases require careful offset planning.
- Is Easter Island on the same schedule?
- No, Chile’s Easter Island follows its own national zone with a distinct offset and separate daylight-saving adjustments.
- What puts CLST ahead of its standard time?
- During summer months, Santiago nudges clocks forward an hour to make use of longer daylight in the evening.
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