EXIF tags object
Optionalopts: Pick<ExifToolOptions, "adjustTimeZoneIfDaylightSavings">Optional function to adjust timezone for DST. Defaults to handling Nikon's DaylightSavings quirk.
TzSrc with zone and provenance, or undefined if no timezone found
const tags = await exiftool.read("photo.jpg")
const tzSrc = extractTzOffsetFromTags(tags)
if (tzSrc) {
console.log(`Timezone: ${tzSrc.zone}`)
console.log(`Source: ${tzSrc.src}`) // e.g., "OffsetTimeOriginal"
}
// Nikon DST handling
const nikonTags = {
TimeZone: "-08:00",
DaylightSavings: "Yes",
Make: "NIKON CORPORATION"
}
extractTzOffsetFromTags(nikonTags)
// { zone: "UTC-7", tz: "UTC-7",
// src: "TimeZone (adjusted for DaylightSavings)" }
Extract timezone offset from standard EXIF timezone tags.
Checks timezone tags in priority order:
Handles camera-specific quirks like Nikon's DaylightSavings tag, which requires adjusting the TimeZone offset forward by one hour during DST.