P: (Windows-only) incorrectly rounds a capture date/time with fractional seconds of 0.99974

[johnrellis]

LR 15.0.1 / Windows incorrectly rounds a capture date/time of 11/13/25 10:30:03.99974 PM to 1/1/1601 4:00:00.477 PM.  But LR 15.0.1 / Mac correctly rounds it to 11/13/25 10:30:04.000 PM.

Tested on LR 15.0.1 / Windows 11 Intel, Windows 11 ARM, and Mac OS 15.7.1. To reproduce:

1. Download and open this catalog:

https://www.dropbox.com/scl/fi/3psajur7hfth6ezly98vk/subsec-bug.2025-11-18.zip?rlkey=e3ww25awh8wf3rm...

It contains two photos with these capture date/times:

subsec.dng:         2025:11:13 22:30:03.99974
subsec-smaller.dng: 2025:11:13 22:30:03.99900

2. Right-click the folder "pics" and do Synchronize Folder.

3. On Mac, observe the capture/date times of the two photos have been rounded correctly:

But on Windows 11, observe that the capture time of "subsec.dng" has been mangled to 1/1/1601 4:00:00.477:

[Jake Frank]

During import, some, but not all files appear to have no date attached. Video file dates revert 1970 and raw files revert to 1601. 

When I look at the metadata of the original file in File Explorer, it seems to be correct. Below is an example:

[johnrellis]

To troubleshoot this most efficiently, please share a sample raw with the problem. If the forum won't let you attach the file here, upload it to Wetransfer, Dropbox, Google Drive or similar free service and post the sharing link here.

[Jake Frank]

https://drive.google.com/file/d/1FyRQ0Ci_1DY2UkDLkbtwo23eDmfqcNhc/view?usp=sharing

[johnrellis]

[This post contains formatting and embedded images that don't appear in email. View the post in your Web browser.]

That photo imports correctly into my LR 15.0.1 / Mac OS 15.7.1, both from a hard drive folder and from an SD card onto which I had copied the photo:

But examining its metadata, I see that its metadata has been modified by LR. Further, it contains these dates:

[EXIF] Modify Date        : 2025:11:17 16:14:45
[EXIF] Preview Date Time  : 2025:11:17 16:14:45-07:00
[EXIF] Date/Time Original : 2025:11:13 22:30:03
[EXIF] Create Date        : 2025:11:13 22:30:02
[EXIF] Preview Date Time  : 2025:11:17 16:14:45-07:00
[XMP]  Modify Date        : 2025:11:17 16:14:45-07:00
[XMP]  Create Date        : 2025:11:13 22:30:02Z
[XMP]  Metadata Date      : 2025:11:17 16:14:45-07:00
[XMP]  Date Created       : 2024:10:10 16:56:20.30-07:00

Without getting into all the gory details of what they mean, one field, XMP:CreateDate, doesn't match EXIF:Date/TimeOriginal (though it should).

1. Can you share a DNG directly from the camera that hasn't yet been imported into LR? (It's OK to look at it in the Import window to make sure that it's being mishandled, but don't complete the Import operation with it.)

2. Please post a full-resolution screenshot of the entire LR window with the Import window open showing the problem.

3. Please do the LR menu command Help > System Info and copy/paste the entire contents here so we can see exactly which versions of hardware and software LR thinks you're running and important LR options that are set.

[Jake Frank]

https://drive.google.com/file/d/1hnuTPBZtSXaN2whGvd-q9cenzBSNTi1q/view?usp=sharing

Sorry, brainfart. Thanks for the help looking into this. Above is direct from the camera card.

[Jake Frank]

Lightroom Classic version: 15.0 [ 202510171722-44f87028 ]

License: Creative Cloud

Language setting: en

Operating system: Windows 11 - Enterprise Edition

Version: 11.0.22631

Application architecture: x64

System architecture: x64

Logical processor count: 32

Processor speed: 2.4GHz

SqLite Version: 3.36.0

CPU Utilisation: 0.0%

Power Source: Plugged In

Built-in memory: 65220.7 MB

Dedicated GPU memory used by Lightroom: 888.5MB / 7957.0MB (11%)

Real memory available to Lightroom: 65220.7 MB

Real memory used by Lightroom: 4874.5 MB (7.4%)

Virtual memory used by Lightroom: 4611.6 MB

GDI objects count: 958

USER objects count: 2693

Process handles count: 3625

Memory cache size: 25.7MB

Internal Camera Raw version: 18.0 [ 2389 ]

Maximum thread count used by Camera Raw: 5

Camera Raw SIMD optimization: SSE2,AVX,AVX2

Camera Raw virtual memory: 1144MB / 32610MB (3%)

Camera Raw real memory: 1145MB / 65220MB (1%)

Cache1: 

NT- RAM:0.0MB, VRAM:0.0MB, Combined:0.0MB

Cache2: 

m:25.7MB, n:0.0MB

U-main: 137.0MB

System DPI setting: 120 DPI

Desktop composition enabled: Yes

Standard Preview Size: 2199 pixels

Displays: 1) 3840x2160, 2) 3840x2160

Input types: Multitouch: Yes, Integrated touch: Yes, Integrated pen: No, External touch: No, External pen: No, Keyboard: No

Graphics Processor Info: 

DirectX: NVIDIA RTX 2000 Ada Generation Laptop GPU (32.0.15.8092)

Init State: GPU for Export supported by default

User Preference: Auto

Enable HDR in Library: OFF

GPU for Preview Generation: Auto (S5_7)

Application folder: C:\Program Files\Adobe\Adobe Lightroom Classic

Library Path: C:\Users\jacobfrank\OneDrive - DOI\Pictures\Lightroom\Jacob W Frank.lrcat

Settings Folder: C:\Users\jacobfrank\AppData\Roaming\Adobe\Lightroom

Installed Plugins: 

1) AdobeStock

2) Flickr

Config.lua flags: 

Adapter #1: Vendor : 10de

Device : 28b8

Subsystem : c411028

Revision : a1

Video Memory : 7957

Adapter #2: Vendor : 8086

Device : a788

Subsystem : c411028

Revision : 4

Video Memory : 80

Adapter #3: Vendor : 1414

Device : 8c

Subsystem : 0

Revision : 0

Video Memory : 0

AudioDeviceIOBlockSize: 1024

AudioDeviceName: System Default - BenQ PD2700U (2- HD Audio Driver for Display Audio)

AudioDeviceNumberOfChannels: 2

AudioDeviceSampleRate: 48000

Build: LR5x26

Direct2DEnabled: false

GL_ACCUM_ALPHA_BITS: 16

GL_ACCUM_BLUE_BITS: 16

GL_ACCUM_GREEN_BITS: 16

GL_ACCUM_RED_BITS: 16

GL_ALPHA_BITS: 0

GL_BLUE_BITS: 8

GL_DEPTH_BITS: 24

GL_GREEN_BITS: 8

GL_MAX_3D_TEXTURE_SIZE: 16384

GL_MAX_TEXTURE_SIZE: 32768

GL_MAX_TEXTURE_UNITS: 4

GL_MAX_VIEWPORT_DIMS: 32768,32768

GL_RED_BITS: 8

GL_RENDERER: NVIDIA RTX 2000 Ada Generation Laptop GPU/PCIe/SSE2

GL_SHADING_LANGUAGE_VERSION: 4.60 NVIDIA

GL_STENCIL_BITS: 8

GL_VENDOR: NVIDIA Corporation

GL_VERSION: 4.6.0 NVIDIA 580.92

GPUDeviceEnabled: false

OGLEnabled: true

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[johnrellis]

The new sample S1010115.DNG also imports correctly into my LR 15.0.1:

Your screenshot shows you're importing via the Files section (the default) rather than the Devices section (a legacy method that sometimes gets dates wrong).  So the problem isn't that.

Exiftool shows all the metadata date/times are consistent.

1. Try placing a copy of that photo on your Desktop folder and import from there. Does it have the same problems?

2. The issue with your videos could be different. Video metadata isn't well-supported by LR.  Share a sample problem video and I'll take a look. It's ok to use a video that's already been imported, since LR never modifies metadata in video files.

[Jake Frank]

Same issue if I move the file to the desktop. I'm a little less concerned about video, since I don't use dates to organize footage. 

So if it's working on your end, it's not an issue with the drone, correct?

[johnrellis]

I was stumped by this for a while. But finally, I tested on Windows, and this is the first metadata bug I recall in years that occurs on Windows but not Mac.  I'll post a bug report.

[johnrellis]

Moderators, @Rikk Flohr: Photography: Please merge with this bug report:

https://community.adobe.com/t5/lightroom-classic-bugs/lr-windows-incorrectly-rounds-a-capture-date-t...

[johnrellis]

@Jake Frank, the video capture date problem you're observing may be the same as the bug with the DNGs. Please share a sample problem video and I'll confirm.

[drtonyb]

I modifiied one of my own test NEF files and found:

SubSecTimeOriginal <= 99950 gives the correct datetime

SubSecTimeOriginal > 99950 gives 1601-01-02 00:00:00 UTC

Go figure that one out. Some one has made a serious mathematical error here.

[Rikk Flohr: Photography]

Thanks for the report @johnrellis  I've logged this. 

[Jake Frank]

Video clip: https://drive.google.com/file/d/1b7dPRcsktqFIwkfu2df0Fm4HNIwgA-IY/view?usp=sharing

Thanks again!

[drtonyb]

@johnrellis wrote

"Without getting into all the gory details of what they mean, one field, XMP:CreateDate, doesn't match EXIF:Date/TimeOriginal (though it should)."

EXIF:DateTimeOriginal has a corresponding EXIF:SubSecTimeOriginal

EXIF:CreateDate (also referred to as EXIF:DateTimeDigitized) has no corresponding EXIF:SubSecTimeDigitized

If the EXIF:DateTimeOriginal is actually 2025:11:13 22:30:02.99974, then it seems to me that the camera has (incorrectly) rounded the EXIF:DateTimeOriginal field's seconds to 03, while the EXIF:CreateDate with no subsec field has its seconds remaining at 02.

My NEF files have  EXIF:DateTimeOriginal, EXIF:SubSecTimeOriginal, EXIF:CreateDate and EXIF:SubSecTimeDigitized.

The SubSec fields are defined as the fractional seconds of the corresponding DateTime tag. The value 99974 must be interpreted as 0.99974 seconds.

How the LrC developers can get this so wrong as to produce a date 424 years ago is completely beyond me, but it certainly needs fixing quickly.

As for the video with a date 1970-01-01, that's the reference date for the Unix timestamp. LrC uses 2001-01-01 for its reference date, so that's also a mysterious error.