Dates and times
Every date and time is UTC; how ranges and freshness work.
On this pageFormatsRangesWhat each date means
Formats
Dates are YYYY-MM-DD; times are ISO 8601 in UTC, such as 2026-10-28T03:12:09Z.
Ranges
from and to include both ends. Without from, a series call returns its most recent limit points.
What each date means
| Field | Means |
|---|---|
changed_at | When a station's price last changed; over 30 days ago, the price is marked stale |
effective_from | When a set price took effect |
date | The day a published average or close is for; a weekly point is dated its last day |
period | The week, month or year an average covers |