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> 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> > 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}\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. >> >> >> _______________________________________________ >> gnhlug-discuss mailing list >> gnhlug-discuss@mail.gnhlug.org >> http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/ >> > _______________________________________________ > gnhlug-discuss mailing list > gnhlug-discuss@mail.gnhlug.org > http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/ >
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