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About this tool
Find a release window that dodges business and peak hours in every region you serve, hour by hour across UTC.
This planner finds a deployment window that avoids business and peak-traffic hours in every region an application serves: it converts each region's local avoid range to UTC, maps all 24 UTC hours as clear or blocked, and recommends the start hour whose window overlaps the fewest blocked region-hours. It is built for release managers and on-call engineers on distributed teams who need one defensible answer to "when can we ship without hitting anyone's daytime".
Open Deployment Window Timezone Planner on AltFTool — it loads instantly in your browser.
Paste your code or data sample into the workspace.
Pick the format, conversion, or analysis you need.
Copy the polished result straight back into your project.
An hour-by-hour UTC map shows each region's local clock and whether it is inside the avoid range.
When no window is fully clear, the planner minimises blocked region-hours instead of giving up.
The recommendation is translated into every region's local start and end for change tickets.
There is no universal hour — the right window is the UTC slot that falls outside business and peak hours in every region you actually serve. For a US East + Europe + India footprint with 08:00-22:00 local avoided, the clear slots collapse to a few hours around 00:00-03:00 UTC, which is why teams compute the window rather than guessing.
Convert each region's avoid range into UTC using its offset, then intersect the remaining free hours: an hour is safe only when it is outside the avoid range in every region. This tool does that conversion for offsets including half-hour zones like India's UTC+5:30 and handles ranges that wrap midnight, such as avoiding 22:00-06:00.
Then minimise the damage: score every possible start hour by how many region-hours of avoid time the window would overlap and pick the lowest. In practice teams pair that least-conflict window with risk reduction — canary or rolling deploys, feature flags and fast rollback — because a fully quiet globe rarely exists past three or four regions.
Yes — the US, UK, EU and parts of Australia shift their offsets by one hour for roughly half the year, which can move a region's business hours into what was a clear UTC slot. The offsets here are standard-time values, so re-run the plan after each DST transition or anchor your windows to a region that does not observe DST, like India or Japan.