From the blog

#utc

2 articles tagged #utc.

A single departure time interpreted three ways — local, UTC, and across a DST boundary — diverging into different answers, in Active Flights brand cyan on near-black.
SSIM & Schedules·

Time zones, UTC and DST: the schedule's quiet minefield

Almost every serious schedule-data bug is, at bottom, a time bug. Local vs UTC, per-station offsets, and daylight-saving transitions turn a simple 'departure time' into one of the trickiest fields in the file.

#ssim#time-zones#utc#dst
A departure and arrival converted through their UTC variations into a correct block time, in Active Flights brand emerald on near-black.
SSIM & Schedules·

Block time, done right: computing it UTC-correct

Departure and arrival times in a SSIM leg are local. Subtract them directly and a cross-timezone flight looks impossibly short, long, or negative. The correct block time goes through each end's UTC variation — here's the method, with a worked example.

#ssim#block-time#utc#time-zones