{"version":"2.1.293","anchor":"deprecation-date-dst-check-replaced-with-a-calendar-computat","canonical_anchor":"deprecation-date-dst-check-replaced-with-a-calendar-computat","heading":"Model deprecation dates now work out Pacific daylight saving time by calendar","tier":"internal","area":"Models","scope":"individual","heads_up":false,"url":"https:\/\/changelogs.core-directive.com\/v\/2.1.293\/e\/deprecation-date-dst-check-replaced-with-a-calendar-computat","release_url":"https:\/\/changelogs.core-directive.com\/v\/2.1.293","markdown":"### Model deprecation dates now work out Pacific daylight saving time by calendar\n\nWhen placing a model's deprecation date in Pacific time, Claude Code now works out daylight saving from the US calendar rules\n\n**What**\n\nModel deprecation dates are written as plain dates and read in Pacific time. To get the right offset, Claude Code used to ask the system's time zone data whether Los Angeles was on daylight saving time. It now works this out itself from the US rule: daylight saving runs from the second Sunday of March to the first Sunday of November.\n\n**Why**\n\nIn normal cases the result is the same as before, so deprecation dates should land on the same moment.\n\n- Area: Models\n- Tier: Under the hood\n- Useful: 1\/5\n- Signal: 0\/5\n- Scope: individual\n- Heads-up: no"}