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Write capture time UTC offset and sub-seconds in write_exif

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Found while testing crates/meta/src/exif.rs:462 (write_exif; compare the reader in from_tiff at crates/meta/src/exif.rs:96-107)

Co-Authored-By: Claude Haiku 5.5 <noreply@anthropic.com>
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
This commit is contained in:
NetterSilver
2026-10-22 17:32:10 +00:00
co-authored by Claude Haiku 5.5
parent c66014e65f
commit 7fcd2b8c99
1 changed files with 21 additions and 0 deletions
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crates/meta/src/exif.rs
+21
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@@ -496,6 +496,19 @@ pub fn write_exif(meta: &Metadata) -> Vec<u8> {
ex.set(tag, v);
}
}
if let Some(d) = meta.capture_time {
let offset = d.offset_minutes.map(|o| {
let sign = if o < 0 { '-' } else { '+' };
format!("{sign}{:02}:{:02}", o.abs() / 60, o.abs() % 60)
});
let subsec = (d.millis != 0).then(|| format!("{:03}", d.millis));
for (tag, v) in [(t::OFFSET_TIME, &offset), (t::OFFSET_TIME_ORIGINAL, &offset), (t::SUBSEC_TIME, &subsec), (t::SUBSEC_TIME_ORIGINAL, &subsec)]
{
if let Some(v) = v {
ex.set(tag, Value::Ascii(v.clone()));
}
}
}
ifd0.set_child(t::EXIF_IFD, ex);
if let Some(g) = meta.gps {
let dms = |v: f64| {
@@ -524,6 +537,14 @@ pub fn write_exif(meta: &Metadata) -> Vec<u8> {
mod write_tests {
use super::*;
#[test]
fn capture_time_offset_and_subsec_round_trip() {
for iso in ["2026-09-20T05:40:00.250+02:00", "2026-09-20T05:40:00.005-03:30", "2026-09-20T05:40:00"] {
let m = Metadata { capture_time: DateTime::parse_iso(iso), ..Default::default() };
assert_eq!(read_exif(&write_exif(&m)).capture_time, m.capture_time, "{iso}");
}
}
#[test]
fn exif_round_trips() {
let m = Metadata {