I (in a BST time zone currently) recorded the UTC clock from time.gov on my phone an Android Pixel 7 Pro for 54 seconds and then downloaded the file from photos.google.com

The 1st frame is this

The last frame is this

The resultant file name is

PXL_20261007_192542364.TS

So the filename contains the (approx) start time

But not only is the time stamps in the metadata for the end of the video it's actually 2 seconds past the time shown on the screen

exiftool -k output: (GPS removed)

File Size : 151 MB
Zone Identifier : Exists
File Modification Date/Time : 2026:10:08 09:19:11+01:00
File Access Date/Time : 2026:10:08 09:19:32+01:00
File Creation Date/Time : 2026:10:08 09:19:06+01:00
File Permissions : -rw-rw-rw-
File Type : MP4
File Type Extension : mp4
MIME Type : video/mp4
Major Brand : MP4 Base Media v1 [IS0 14496-12:2003]
Minor Version : 2.0.0
Compatible Brands : isom, iso2, mp41
Media Data Size : 150717631
Media Data Offset : 44
Movie Header Version : 0
Create Date : 2026:10:07 19:26:37
Modify Date : 2026:10:07 19:26:37
Time Scale : 10000
Duration : 0:00:54
Preferred Rate : 1
Preferred Volume : 100.00%
Preview Time : 0 s
Preview Duration : 0 s
Poster Time : 0 s
Selection Time : 0 s
Selection Duration : 0 s
Current Time : 0 s
Next Track ID : 5
GPS Coordinates :
Android Capture FPS : 30
Android Model : Pixel 7 Pro
Android Make : Google
Track Header Version : 0
Track Create Date : 2026:10:07 19:26:37
Track Modify Date : 2026:10:07 19:26:37
Track ID : 1
Track Duration : 0:00:54
Track Layer : 0
Track Volume : 0.00%
Image Width : 1920
Image Height : 1080
Graphics Mode : srcCopy
Op Color : 0 0 0
Compressor ID : avc1
Source Image Width : 1920
Source Image Height : 1080
X Resolution : 72
Y Resolution : 72
Bit Depth : 24
Pixel Aspect Ratio : 65536:65536
Color Profiles : nclx
Color Primaries : BT.709
Transfer Characteristics : BT.709
Matrix Coefficients : BT.709
Video Full Range Flag : Full
Video Frame Rate : 30.013
Balance : 0
Audio Format : mp4a
Audio Channels : 2
Audio Bits Per Sample : 16
Audio Sample Rate : 48000
Warning : [minor] The ExtractEmbedded option may find more tags in the media data
Matrix Structure : 0 1 0 -1 0 0 0 0 1
Media Header Version : 0
Media Create Date : 2026:10:07 19:26:37
Media Modify Date : 2026:10:07 19:26:37
Media Time Scale : 90000
Media Duration : 0 s
Handler Type : NRT Metadata
Handler Description : MetaHandle
Meta Format : mett
Meta Type : application/microvideo-image-meta
Image Size : 1920x1080
Megapixels : 2.1
Avg Bitrate : 22.4 Mbps
GPS Latitude :
GPS Longitude :
Rotation : 90
GPS Position :

PS C:\Users\xx\Downloads> .\exiftool.exe -time:all -G1 -a -s -api QuickTimeUTC=1 .\PXL_20261007_192542364.TS.mp4
[System] FileModifyDate : 2026:10:08 09:19:11+01:00
[System] FileAccessDate : 2026:10:08 09:31:41+01:00
[System] FileCreateDate : 2026:10:08 09:19:06+01:00
[QuickTime] CreateDate : 2026:10:07 20:26:37+01:00
[QuickTime] ModifyDate : 2026:10:07 20:26:37+01:00
[Track1] TrackCreateDate : 2026:10:07 20:26:37+01:00
[Track1] TrackModifyDate : 2026:10:07 20:26:37+01:00
[Track1] MediaCreateDate : 2026:10:07 20:26:37+01:00
[Track1] MediaModifyDate : 2026:10:07 20:26:37+01:00
[Track2] TrackCreateDate : 2026:10:07 20:26:37+01:00
[Track2] TrackModifyDate : 2026:10:07 20:26:37+01:00
[Track2] MediaCreateDate : 2026:10:07 20:26:37+01:00
[Track2] MediaModifyDate : 2026:10:07 20:26:37+01:00
[Track3] TrackCreateDate : 2026:10:07 20:26:37+01:00
[Track3] TrackModifyDate : 2026:10:07 20:26:37+01:00
[Track3] MediaCreateDate : 2026:10:07 20:26:37+01:00
[Track3] MediaModifyDate : 2026:10:07 20:26:37+01:00
[Track4] TrackCreateDate : 2026:10:07 20:26:37+01:00
[Track4] TrackModifyDate : 2026:10:07 20:26:37+01:00
[Track4] MediaCreateDate : 2026:10:07 20:26:37+01:00
[Track4] MediaModifyDate : 2026:10:07 20:26:37+01:00

I would post it but it contains my GPS location and removing it affects the metadata which I assume you want to check unmolested I can email it to you.

edit its also too big for here, so I have emailed a gdrive link to you