The -well tools · The Picture Org(anizer)
Datewell icon

Datewell™

Date Taken Fixer

Every scan, back on its real date.

Scanned photos all claim they were taken the day you scanned them. Datewell reads the date you already wrote in each file name and sets it as the photo's real Date Taken, so every picture lands in the right place on the timeline.

21-day free trialWindows & Mac appLightroom Classic plug-inVersion 1.7.1

What Datewell does

Scans named 1987-07-04 Lake Tahoe.jpg, phone pictures named IMG_20190312_142310.jpg and prints named July 1965 Christmas.tif all get the right date, so they sort correctly in Lightroom Classic, Windows, Apple Photos, Google Photos and every other program that reads photo dates.

Datewell can also read the orange date stamp a film camera printed in the corner of the picture, or the month and year a lab printed on a print's white border, and you choose which comes first: the file name or the picture. It never guesses: a photo it can't date is left alone, with the reason.

It comes two ways, with one license for both: the Datewell app for Windows and Mac, which needs no Lightroom, and the Lightroom Classic plug-in. Nothing changes until you have seen a preview and clicked Write dates, and every run can be undone.

Datewell reading 1987-07-04 from a file name and a camera date stamp into Date Taken

Datewell in 79 seconds

On screen

The Windows & Mac app: the date read from each file name, shown before anything is written.
The Windows & Mac app: the date read from each file name, shown before anything is written.
The Lightroom Classic plug-in: Set Date Taken, run on 32 selected photos. Preview shows every date before anything is written.
The Lightroom Classic plug-in: Set Date Taken, run on 32 selected photos. Preview shows every date before anything is written.

Features

Dates in many shapes

1987-07-04, 20040704_142310, July 4 1987, 4 Jul 1987, July 1987, Summer 1971, Christmas 1965, phone, WhatsApp and screenshot names, and month names in German, French, Spanish, Italian, Dutch, Portuguese, Swedish, Danish and Norwegian.

Camera date stamps

The orange or red digits film cameras printed in the corner, such as ’97 12 20, including dot-matrix stamps made of orange dots, read digit by digit, either way up. Faint quartz date backs are read too, and a hidden digit can be filled in from the photos beside it.

Dates printed on the border

Many prints from the 1950s to the 1970s carry the month and year they were developed on their border, such as JUNE 1956. Datewell reads them on all four sides, and reads a whole date printed under a portrait or on a border, such as June 12, 2008, with its day.

Read dates in file names, or not

Read dates in file names is on by default. Turn it off to date photos only from the picture itself: the camera's orange date stamp or the date printed on the border.

Which date comes first

You choose whether the file name or the picture (a camera date stamp, then a border date) wins. By default a date stamp beats a file name dated this year, which is usually the scan date, and a scanner's own names, such as Kodak's 20260105144811_00034A, are never taken as the date the photo was taken.

Dates from Google, Apple and Facebook downloads

Photos from a Google Takeout, Apple Photos, iCloud or Facebook download get their real date taken from the files the download keeps beside them. A camera's own Date taken is kept unless you tick Their date replaces a camera's own Date taken.

It never guesses

A name with no date, two different dates, a date that doesn't exist or one in the future is left alone, and the preview says why. US or day-first order is your choice when a date could be read either way.

Preview first, undo any run

Every photo is listed with the date found and the date it has now, with a close-up of any stamp or border date it read. Undo puts the old dates back, in the app or in Lightroom.

Folder names and your own patterns

No date in the name? Use the folder's name instead. Unusual names can be read with a custom pattern such as Roll * DD-MM-YY.

Prints in an order you choose

No date anywhere? In Lightroom Classic, sort the prints by hand (Custom Order), type their date, and each gets that date with a time that follows its place: 12:01 PM, 12:02 PM and so on. Two Rename Photos templates then put the date in front of their names.

Numbered photos stay in order

Photos with the same date get times that follow their numbers, starting from noon (-0001 gets 12:01 PM, -0002 12:02 PM), so sorting by name or by Date taken gives the same order. A time already in the name is kept.

Keys and Stream Deck

Every action has a key: press ? to see them, with Shift for anything that writes. A Stream Deck or other macro pad can run them too, including Datewell's Lightroom commands. Ready-made buttons come with Datewell, one profile for the app and one for Lightroom: press ? and click Add Stream Deck buttons. In Lightroom you can give Datewell's commands your own keys: click Keyboard shortcuts beside User Guide. The same window can give a key to another plug-in's menu item, such as Negative Lab Pro, by its name.

Hard stamps online, if you like

For stamps your computer can't read, Datewell can ask Claude, OpenAI or Google Gemini with your own API key. Only the photo's bottom right corner is sent, never the whole photo.

How it works

In the app

  1. Choose a folder (with the folders inside it if you like) or some photos.
  2. Click Preview the dates and check the list. Untick any photo you want left alone.
  3. Click Write dates. Changed your mind? Undo this run, now or later.

In Lightroom Classic

  1. Select the photos and choose Library > Plug-in Extras > Set Date Taken…, then click Preview.
  2. Check the preview and click Write dates. Datewell first has Lightroom save its own changes to the files, so crops, keywords and captions you haven't saved are kept.
  3. Datewell writes the dates, then has Lightroom read them back from the files.

Step by step for every job: the Datewell User Guide.

Requirements

Windows
Windows 10 or 11 (64-bit). Nothing else to install: Python and the image libraries come with it.
Mac
A Mac with Apple silicon (M1 or later) and macOS 13 or later. Intel Macs aren't supported.
Lightroom Classic
For the plug-in only. The app needs no Lightroom, just a current web browser (Edge, Chrome, Safari or Firefox).
Files
JPEG, TIFF, DNG, HEIC, PNG, WebP and PSD get the date inside the file. Camera raw files get an .xmp sidecar beside them, as Lightroom and Bridge make, or the date in the raw file itself if you choose. Date stamps and border dates are read on JPEG, TIFF, PNG, DNG and camera raw files (NEF, CR2, ARW and others).

Price and free trial

$29
One license · up to 2 computers · never expires
Try it first:
  • Every feature works free for 21 days on each computer, with no watermark and no account. After that, Datewell keeps working for 7 more days with a reminder; then the preview still works, and writing dates needs a license key.
  • One license is for one person on up to 2 computers, covers both the app and the Lightroom Classic plug-in, and includes complimentary updates within the major version (a version 1 key works for every 1.x release).
  • Your key arrives by email. It is checked on your computer: no account or internet connection is needed to use Datewell.
  • Moving to a new computer? Click “Remove license from this computer” on the old one and enter your key on the new one.
  • Also in The Well Tools Bundle: Squarewell™, Spoolwell™, Pivotwell™, Datewell™ and Labelwell™ on one license key for $149.

Windows may show “Windows protected your PC” the first time: click More info, then Run anyway. The Mac download is signed and checked by Apple: open it and double-click the Install app.

Lost your key? · License terms · Refund policy · Questions: info@thepictureorg.com

Questions

My antivirus or Windows blocked the download. Is it safe, and what do I do?

Datewell is signed by The Picture Org LLC and is safe. Some antivirus programs (Norton, for example) flag any new download that few people have run yet, even a signed one, and the block goes away as more people install it. Windows SmartScreen (“Windows protected your PC”): click More info, then Run anyway. Norton: open Norton, go to Security > History, choose the entry for the download, and click Restore & exclude this file, then run it again. Microsoft Defender: open Windows Security > Virus & threat protection > Protection history, choose the entry, and click Actions > Allow on device. Other antivirus programs have a similar Restore or Allow choice in their quarantine or history. If you would rather not change a setting, email info@thepictureorg.com and we will send you a zip you can install by hand. We report every false alarm to the antivirus maker so it is cleared for everyone.

Why do my scans show the wrong date?

A scanner writes the day of the scan as the photo's date, so a 1965 picture sorts as if it were taken this year. Datewell replaces that date with the one in the file name, a date stamp or the print's border.

What if the name only has a year or a month?

The photo gets the first of that month (or January 1) as its Date Taken, because that field needs a full date, and the XMP “Date Created” field keeps exactly what the name said, so programs that understand partial dates show it as 1987 or July 1987.

What time does it use?

Dates without a time get 12:00 noon, so a time zone change can't move them to the day before. Numbered photos with the same date get a minute apart in number order (12:01 PM, 12:02 PM), and you can choose another time.

My photos came from Google Takeout. Can Datewell help?

Yes. A Google Takeout, Apple Photos, iCloud or Facebook download often loses each photo's date taken, and keeps it in a separate file beside the photo. Datewell reads those files and puts the real date back into each photo, so they sort correctly again.

Will it change my pictures?

No. Only the date fields are written. The picture itself is never opened or saved again, so there is no loss of quality, and keywords and captions stay as they are. Each photo is read back to check the new date is there.

Does it work on a NAS or network drive?

Yes. Before writing, Datewell checks that each folder can be written to. A read-only folder (for example a locked or archived folder on a NAS) is left alone and its photos are listed as Not written with the reason, while the other folders are dated as usual. Searches skip the snapshot and recycle-bin folders a NAS keeps.

Why are there extra steps in Lightroom?

Lightroom doesn't let plug-ins change the capture time in its catalog, so Datewell writes the dates into the files and has Lightroom read them back. Datewell has Lightroom save its own changes to the files first, so crops, keywords and captions you haven't saved yet are kept.

Does anything get sent online?

No, unless you turn on reading hard date stamps online with your own API key. Then only the bottom right corner of a photo is sent, and the cost goes on your own account, well under a dollar per thousand photos with the usual models. A key you saved in Labelwell or Sortwell works in Datewell too.

Is anything sent from my computer?

Only a check for a newer version when Datewell opens, which fetches a small version list and sends nothing about your computer, your photos or your license key. You can turn it off. If something goes wrong, Create an error log can send a report to us, but only after you have seen exactly what it holds and clicked Send. Online reading, if you turn it on, sends only what is described above, with your own API key.

How do updates work?

Datewell tells you when a new version is out. Install now downloads it, checks that it carries The Picture Org's signature, and installs it, putting everything back if anything goes wrong. Installing it in the app or in Lightroom updates both. Updates within the major version are complimentary.

Does it work with Lightroom (the cloud version)?

No. Adobe lets plug-ins run only in Lightroom Classic. If you use the Lightroom app, use the Datewell app on your photo folders instead.

Does it run on an Intel Mac?

No. Datewell needs a Mac with Apple silicon (M1 or later).

More answers in the Datewell User Guide, or email info@thepictureorg.com.

What's new

Version 1.7.1 12 November 2026

  • Datewell sticks to dates: it no longer adds a download’s captions and GPS locations to your photos. Captions and places that 1.7.0 added stay on your photos, and undoing a 1.7.0 run still takes them off.
  • Reads Facebook downloads in HTML, Facebook’s default format, as well as JSON.
Earlier versions

Version 1.7.0 11 November 2026

  • New: dates from a Google Takeout, Apple Photos, iCloud or Facebook download. Photos downloaded from these services often carry the day they were downloaded. Datewell now reads the files the download keeps beside the photos and gives each photo the date it was taken, even when Google shortened the names, numbered copies or kept edited copies.
  • A camera’s own Date taken is kept, unless you tick Their date replaces a camera’s own Date taken.
  • Datewell can also add the download’s caption and GPS location to photos that have none of their own. Both are on by default, and a caption or location a photo already has is never replaced.
  • The preview counts the photos that had a download file, those with none, and those whose file has no date.
  • Mac: Datewell now needs a Mac with Apple silicon (M1 or later). On an Intel Mac, the installer says so and stops. The Windows version runs on any 64-bit Windows 10 or 11 PC.
  • Lightroom: the Check date stamp keyword now sits under Picture Org, the one keyword all our apps share. Once you’ve run this version, you can delete the old Datewell keyword in the Keyword List.

Version 1.6.40 7 November 2026

  • The Keyboard shortcuts window can also give a key to another plug-in’s menu item, such as Negative Lab Pro, by its name.
  • Lightroom on Windows: the Updates box in the Plug-in Manager now shows its whole message. Before, a long message could still be cut off.
  • Lightroom: writing dates starts sooner on large selections.

Version 1.6.39 6 November 2026

  • Safety improvements from our security review. On a Mac, installing no longer clears the download check on Datewell’s Lightroom plug-in, and the app only opens folders of the photos you are working on.

Version 1.6.38 5 November 2026

  • Choose your own keys for Datewell’s Lightroom commands: click Keyboard shortcuts in Lightroom. They keep working however many plug-ins you add.
  • Lightroom: long messages in the Plug-in Manager’s Updates box no longer run off the right edge.

Version 1.6.37 5 November 2026

  • Datewell now comes with ExifTool 13.60, the tool that writes the dates into your files. Photos from Samsung phones saved as HEIC motion photos now stay motion photos after Datewell writes their dates. Before, the phone’s gallery could stop playing them; writing the date again with this version repairs them.
  • If Datewell is stopped unexpectedly, ExifTool now closes with it instead of being left running in the background.
  • Damaged or unusual files are handled more safely, and Sony ARW files stay readable in Sony’s own software when Datewell writes into the raw file itself (a setting that is off by default).
  • Since ExifTool inside Datewell is new, Install update downloads and runs the full Setup this time.

Version 1.6.36 5 November 2026

  • A whole date printed under a portrait or on a border, such as June 12, 2008, is now read with its day. Before, it could be read as June 2012.
  • Leafy, sunlit backgrounds are no longer mistaken for a camera’s date stamp.

Version 1.6.35 5 November 2026

  • Date stamps and dates printed on borders are now read in DNG and camera raw files (NEF, CR2, ARW and others) too. Before, only JPEG, TIFF and PNG files were read, so photos taken with a camera on a copy stand and kept as raw or DNG files got no date from the picture.
  • Lightroom: photos turned in Lightroom are read the way Lightroom shows them, so a date stamp on a turned photo is read upright.
  • Lightroom: the command is now called Set Date Taken..., since reading file names is optional.

Version 1.6.34 4 November 2026

  • New check box: Read dates in file names. Turn it off to date photos only from the picture itself, the camera’s orange date stamp or the date printed on the border, when your file names carry other dates such as the day of the scan.
  • Lightroom: each Datewell window and the Plug-in Manager now have a Keyboard shortcuts button.
  • Lightroom: choosing a service for reading hard date stamps online in the Plug-in Manager is now saved properly.
  • Setup now reports a clear error code to package managers when Lightroom is open or the app can’t be closed.

Version 1.6.33 3 November 2026

  • Date stamps made of orange dots, such as the 1 20 ’05 some cameras printed in the 2000s, are now read. Before, such a stamp could go unread or, now and then, be read as the wrong date.

Version 1.6.32 3 November 2026

  • New setting: Which date comes first, the file name or the picture (a camera’s date stamp, then a date printed on the border). By default, when a file name’s date is this year, or the name comes from a photo scanner (such as Kodak’s 20260105144811_00034A), the date in the picture now comes first, since those names usually give the day of the scan. You can choose the file name first, or the picture first for every photo.
  • Windows: the User Guide shortcut in the Start menu now has its own page icon, so it’s easy to tell from the app.
  • Windows: Setup uses the same plain names as our other apps for what it installs, and uninstalling can also remove Datewell’s settings, logs and undo records if you tick that box. Your license key is always kept.

Version 1.6.31 1 November 2026

  • Keys for every action: press ? in the app to see them. Anything that writes to your files needs Shift, so a stray key press never changes them.
  • Stream Deck buttons come with Datewell: press ? and click Add Stream Deck buttons. Two ready-made Stream Deck profiles: one for the apps, one for Lightroom. In Lightroom, a Stream Deck button can run Datewell’s commands.
  • Lightroom: each of Datewell’s windows now has a User Guide button.

Version 1.6.30 30 October 2026

  • Closing Datewell while it is working now asks first. In the app, Quit asks whether to keep working or quit anyway, and closing the window’s tab asks too. In Lightroom, the x on Datewell’s progress bar asks whether to keep working or stop now.
  • Lightroom: when only one photo is selected, Set Date taken offers to date every photo in its folder.
  • The error log can now be sent to The Picture Org with one click, from the app or from Lightroom.
  • An API key for reading hard date stamps online that you saved in Labelwell or Sortwell now works in Datewell too.
  • Mac: having Lightroom read the new dates from the files is more reliable.

Version 1.6.29 27 October 2026

  • Lightroom: before writing dates or undoing a run, Datewell now has Lightroom save its own changes to the files first, so crops (from Squarewell or made by hand), keywords and captions you haven’t saved yet are kept. If Datewell can’t do that for you, it asks you to save them and click Continue.

Version 1.6.28 27 October 2026

  • Datewell’s version numbers now start with 1. This version follows 0.9.27; nothing else changes, and your license key keeps working.

Version 0.9.27 26 October 2026

  • The app now checks for a newer version every time it opens.
  • Lightroom: Datewell checks for a newer version every time Lightroom starts, not once a day.
  • Installing an update from the app now updates the Lightroom plug-in too, and the other way round.

Version 0.9.26 26 October 2026

  • Network folders and NAS drives: before writing, Datewell checks that each folder can be written to. A read-only folder is left alone and listed as Not written with the reason, and the other folders are dated as usual.
  • When you ask Datewell to set a file’s Date created on Windows and the drive doesn’t keep it (many network drives and memory cards don’t), the photo now says “Date created not kept” instead of nothing. Its Date taken is still set.
  • The app no longer looks through the snapshot and recycle-bin folders a NAS keeps (such as #snapshot and #recycle) when you include the folders inside a folder.

Version 0.9.25 26 October 2026

  • Windows: Setup and uninstall now close a running Datewell first, so updating or removing it no longer fails on files in use.

Version 0.9.24 25 October 2026

  • Lightroom’s Plug-in Manager: the buttons now sit on two rows, so the Datewell icon stays inside the box.
  • The User Guide now starts with what Datewell is and a Quick start, then step-by-step guides for each kind of photo.

Version 0.9.23 25 October 2026

  • A new “Other -well tools” button in Lightroom’s Plug-in Manager, and in the app’s Menu, opens our Tools page with every -well tool.
  • When Datewell finishes writing dates or putting them back, it now says how long that took.

Version 0.9.22 25 October 2026

  • A new “User Guide” button in Lightroom’s Plug-in Manager, next to “Datewell home page”, opens the User Guide on our website (or the copy that came with Datewell when you’re offline). In the app, Menu > User Guide opens the web guide too.
  • The website button in Lightroom’s Plug-in Manager is now “Datewell home page” and opens Datewell’s own page.

Version 0.9.20 25 October 2026

  • New in Lightroom Classic: Date photos in their Lightroom order. Sort prints by hand (Custom Order), pick their date, and each photo gets that date with a time that follows its place (12:01 PM, 12:02 PM, …). Lightroom’s own Rename Photos then puts the date in front of their names, with two templates Datewell adds: “Datewell date first” and “Datewell date first sequence” (adds -0001, -0002 in your order).

Version 0.9.19 24 October 2026

  • Numbered photos with the same date now get times that follow their numbers, starting from noon: “-0001” gets 12:01 PM, “-0002” 12:02 PM, and so on. Sorting by file name or by Date taken now gives the same order. Times already in a file name are kept, as before. On by default; you can turn it off in the settings.
  • Fixed: in Lightroom, adding the “Check date stamp” keyword after the new dates were read could stop with an error.

Version 0.9.18 24 October 2026

  • In Lightroom Classic, the plug-in now appears as “tpo: Datewell™” so all The Picture Org plug-ins sit together.

Version 0.9.17 24 October 2026

  • Faster reading of date stamps and print borders: Datewell now reads several photos at once, one for each processor core. On our 52-photo test set, 13 minutes became 9.5 on a 4-core computer. The dates it reads are exactly the same.

Version 0.9.16 24 October 2026

  • Updates: when a new version needs the full installer (for example a newer Python inside Datewell), Install update now downloads it, checks that it is genuine and unchanged, and starts it for you, instead of sending you to the download page.

Version 0.9.15 24 October 2026

  • Starts faster: the app opens its window right away, and reading date stamps and borders gets under way sooner. The dates it reads are exactly the same.

Version 0.9.14 24 October 2026

  • The User Guide now has step-by-step instructions for getting an API key from Claude, Google Gemini or OpenAI to read hard date stamps online, with a note on what each service does with what you send.
  • User Guide: a new Updates section; the License and Help sections now match the other Picture Org apps.

Version 0.9.13 23 October 2026

  • Date stamps that are hard to read now give the same answer every time you run Datewell on the same photos.

Version 0.9.12 23 October 2026

  • Behind the scenes: Datewell now shares its license, update and setup code with the other Picture Org apps, so fixes reach every app at once. License messages now use Datewell's full product name.

Version 0.9.11 23 October 2026

  • Lightroom Classic: if Datewell's helper can't start, you now get a message instead of a wait that never ends.
  • Mac: saving an online-reading API key is a little safer.

Version 0.9.10 23 October 2026

  • A new Datewell icon: the photo behind the calendar page now shows The Picture Org camera in front of the hills. Your Start menu and desktop shortcuts pick it up after the update.

Version 0.9.9 23 October 2026

  • Faster reading of date stamps and printed borders: each photo is now opened once instead of twice.
  • Lightroom Classic: large selections get started sooner.

Version 0.9.8 23 October 2026

  • Optional: date stamps this computer can't read can also be read online, with your own Claude, OpenAI or Google Gemini API key. Only the bottom right corner of the photo is sent, never the whole photo. Turn it on in Lightroom's Plug-in Manager, or in the app under the date stamp setting (Read hard stamps online). The app and the plug-in share the same settings.
  • Windows app: Choose a folder and Choose photos now open their window reliably. If the window can't open, Datewell says so and points you to the box where you can paste a folder's path.
  • Lightroom Classic on Windows: a run no longer risks stopping while Lightroom is showing its progress.

Version 0.9.6 22 October 2026

  • Thin, faint date stamps from quartz date backs are now read, even over a busy background.
  • When part of a date stamp is hidden, Datewell compares what it can see with the stamps of the photos next to it, and uses their date if exactly one fits. These photos are flagged so you can check them.
  • Lightroom Classic: the preview now shows pictures. Each photo has the date found and a close-up of the stamp or border it was read from, and the thumbnails can be made larger or smaller. The text list is still there in its own tab.
  • Photos with a date stamp Datewell could not read now show a close-up of the stamp, so you can read it yourself.
  • In Lightroom's Plug-in Manager, the License section is now last, just above Status.
  • Once a license is entered, the License section says thank you.
  • The Plug-in Manager and the app now show the Datewell icon beside the description.
  • Windows: Settings > Apps shows the Datewell icon, and Setup has a new picture.

Version 0.9.5 22 October 2026

  • App: check the dates before writing them. A slider makes the thumbnails bigger, a click shows a photo large (and at full size), and for dates read from a camera's date stamp or a print's border the part of the photo Datewell read is shown beside the date.
  • App: paste or type a folder's path instead of clicking through folders; on Windows the folder dialog now has an address bar you can type into.
  • Download files are now named ThePictureOrg-Datewell-…

Version 0.9.4 22 October 2026

  • Photos with a camera date stamp Datewell can't fully read (say, something red crosses it) are now flagged so you can check them: the app has a "Date stamp not read" filter, and in Lightroom Classic they get the keyword Datewell > Check date stamp, which is never exported.
  • The app's progress bar now shows which photo it is on and about how long is left (reading date stamps and borders takes a few seconds a photo).

Version 0.9.3 22 October 2026

  • New: reads the orange date a film camera printed in the corner of the picture (91 1 27, 30 10 '97) when the file name has no date, or only the year. The stamp gives the full date; with a year in the name, it must be from that same year.

Version 0.9.2 21 October 2026

  • Reads seasons: "1971 Summer" or "Fall of 1965" gets the middle month of the season (winter January, spring April, summer July, fall October).
  • Reads European month names (German, French, Spanish, Italian, Dutch, Portuguese and Scandinavian, with or without accents), such as "4. Juli 1987" or "4 juillet 1987".
  • Day first or month first for dates like 07-04-2004 now starts out matching your computer's region.
  • New: reads the month and year a lab printed on a print's white border (JUNE 1956, JUL · 57) when the file name has no date, or only the year.

Version 0.9.1 21 October 2026

  • Lightroom Classic: after writing the dates (or undoing a run), Datewell now has Lightroom read the new dates from the files for you (Metadata > Read Metadata from Files). On a Mac, allow Lightroom under System Settings > Privacy & Security > Accessibility the first time.

Version 0.9.0 21 October 2026

  • First version, for testing: sets each photo's Date taken from the date in its file name, in the Datewell app (Windows and Mac) or the Lightroom Classic plug-in.
  • Reads phone and camera names (IMG_20190312_142310), year-month-day names with any separators, US or day-first dates, two-digit years, month names (July 4 1987), month-and-year and year-only names, the folder's name, and a custom pattern of your own.
  • Always a preview first; nothing changes until you click Write dates. Each photo is read back to check the date, and every run can be undone.
  • Writes the EXIF, XMP and IPTC date fields together; camera raw files get an .xmp sidecar. The pictures themselves are never re-saved.

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