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immich/mobile/lib/extensions/asset_extensions.dart

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import 'package:immich_mobile/shared/models/asset.dart';
import 'package:timezone/timezone.dart';
extension TZExtension on Asset {
/// Returns the created time of the asset from the exif info (if available) or from
/// the fileCreatedAt field, adjusted to the timezone value from the exif info along with
/// the timezone offset in [Duration]
(DateTime, Duration) getTZAdjustedTimeAndOffset() {
DateTime dt = fileCreatedAt.toLocal();
if (exifInfo?.dateTimeOriginal != null) {
dt = exifInfo!.dateTimeOriginal!;
if (exifInfo?.timeZone != null) {
dt = dt.toUtc();
try {
final location = getLocation(exifInfo!.timeZone!);
dt = TZDateTime.from(dt, location);
} on LocationNotFoundException {
RegExp re = RegExp(
r'^utc(?:([+-]\d{1,2})(?::(\d{2}))?)?$',
caseSensitive: false,
);
final m = re.firstMatch(exifInfo!.timeZone!);
if (m != null) {
final duration = Duration(
hours: int.parse(m.group(1) ?? '0'),
minutes: int.parse(m.group(2) ?? '0'),
);
dt = dt.add(duration);
return (dt, duration);
}
}
}
}
return (dt, dt.timeZoneOffset);
}
}