Weird, it is just the 5 hours between UT and EST. The files are
generated on a non-linux embedded machine.
If I create a file on my pc, then the TZ information is present and the
time is set. ls reads it correctly.
This time stuff can get confusing. As you were.
On 3/4/21 7:13 PM, Bruce Labitt wrote:
Good point. I'll check that. Logging machine was set to local time
EST. But it does have a wireless link, maybe it set itself internally
to UT. Thanks for the hint.
On Thu, Mar 4, 2021, 7:05 PM Dana Nowell
<dananow...@cornerstonesoftware.com
<mailto:dananow...@cornerstonesoftware.com>> wrote:
If I'm reading it correctly, it's a 5 hr difference? Local vs gmt?
On Thu, Mar 4, 2021, 6:43 PM Bruce Labitt
<bruce.lab...@myfairpoint.net
<mailto:bruce.lab...@myfairpoint.net>> wrote:
This is an odd question. It involves both python and linux.
Have a bunch of files in a directory that I'd like like to
sort by similar names and in time order. This isn't
particularly difficult in python. What is puzzling me is the
modified timestamp returned by python doesn't match whats
reported by the file manager nautilus or even ls. (ls and
nautilus are consistent)
$ lsb_release -d Ubuntu 20.04.2 LTS
$ nautilus --version GNOME nautilus 3.36.3
$ python3 --version Python 3.8.5
$ ls -lght
total 4.7M
-rw-r--r-- 1 bruce 209K Feb 26 01:49 20210226_022134_PLD.edf
-rw-r--r-- 1 bruce 65K Feb 26 01:49 20210226_022134_SAD.edf
-rw-r--r-- 1 bruce 2.4M Feb 26 01:49 20210226_022133_BRP.edf
-rw-r--r-- 1 bruce 1.1K Feb 26 00:58 20210225_224134_EVE.edf
-rw-r--r-- 1 bruce 1.9M Feb 25 21:18 20210225_224141_BRP.edf
-rw-r--r-- 1 bruce 169K Feb 25 21:17 20210225_224142_PLD.edf
-rw-r--r-- 1 bruce 53K Feb 25 21:17 20210225_224142_SAD.edf
Python3 script
#!/usr/bin/env python3
import os
from datetime import datetime
def convert_date(timestamp):
d = datetime.utcfromtimestamp(timestamp)
formatted_date = d.strftime('%d %b %Y %H:%M:%S')
return formatted_date
with os.scandir('feb262021') as entries:
for entry in entries:
if entry.is_file():
info = entry.stat()
print(f'{entry.name <http://entry.name>}\t Last
Modified: {convert_date(info.st_mtime) }' ) # last modification
info /(after exit) contains/: os.stat_result(st_mode=33188,
st_ino=34477637, st_dev=66306, st_nlink=1, st_uid=1000,
st_gid=1000, st_size=213416, st_atime=1614379184,
st_mtime=1614322176, st_ctime=1614379184)
Running the script results in:
20210226_022133_BRP.edf Last Modified: 26 Feb 2021 06:49:34
20210225_224141_BRP.edf Last Modified: 26 Feb 2021 02:18:42
20210225_224142_PLD.edf Last Modified: 26 Feb 2021 02:17:44
20210225_224142_SAD.edf Last Modified: 26 Feb 2021 02:17:44
20210225_224134_EVE.edf Last Modified: 26 Feb 2021 05:58:26
20210226_022134_SAD.edf Last Modified: 26 Feb 2021 06:49:36
20210226_022134_PLD.edf Last Modified: 26 Feb 2021 06:49:36
Actually, what is returned by my script is at least sensible,
given that 20210225_224141_BRP.edf started on Feb 25th and
ended recording at 2:17am on Feb 26th. I know this because I
can see the data on a separate program.
20210226_022133_BRP.edf started on Feb 26th at around 2:21am
and terminated at 6:49am. BRP files are written to
continuously at a 25 Hz rate all evening. What makes no sense
whatsoever is what *ls* is reporting.
Do *ls* and python3 use different definitions of "last modified"?
Guess I can keep going, but I really was surprised at the
difference between methods. Default for ls is "last
modified", at least as reported by man. ls's last modified
just isn't correct, at least on Ubuntu 20.04.2
Is this a quirk? Am I doing something wrong? Some kind of
voodoo definition of "last modified"? What does Linux say
"last modified" really means?
FWIW, I am coming up to speed on processing these edf files to
help out on an open source project. Been working on some data
analysis tools. As an aside, biological data is very messy.
It's been a treat to work on this as it's forced me to dust
off the mental cobwebs and work on a problem that can help a
lot of people.
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