Re: date and time comparison how to
On Mon, 2012-10-29 at 16:13 -0700, noydb wrote: All, I need help with a date and time comparison. Say a user enters a date-n-time and a file on disk. I want to compare the date and time of the file to the entered date-n-time; if the file is newer than the entered date-n-time, add the file to a list to process. How best to do? I have looked at the datetime module, tried a few things, no luck. Is os.stat a part of it? Tried, not sure of the output, the st_mtime/st_ctime doesnt jive with the file's correct date and time. ?? Any help would be appreciated! Date and time is much more complicated then people guess at first. http://taaviburns.ca/what_you_need_to_know_about_datetimes/datetime_transforms.html http://www.whitemiceconsulting.com/2012/10/setting-course-for-utc.html What do you mean by st_mtime/st_ctime doesnt jive with the file's correct date? Is it off my some offset, or does it completely not match? -- http://mail.python.org/mailman/listinfo/python-list
RE: date and time comparison how to
Gary Herron wrote: On 10/29/2012 04:13 PM, noydb wrote: All, I need help with a date and time comparison. Say a user enters a date-n-time and a file on disk. I want to compare the date and time of the file to the entered date-n-time; if the file is newer than the entered date-n-time, add the file to a list to process. How best to do? I have looked at the datetime module, tried a few things, no luck. Is os.stat a part of it? Tried, not sure of the output, the st_mtime/st_ctime doesnt jive with the file's correct date and time. ?? Any help would be appreciated! Use the datetime module (distributed with Python) to compare date/times. You can turn a filesystem time into a datetime with something like the following: import datetime, os, stat mtime = os.lstat(filename)[stat.ST_MTIME] // the files modification time dt = datetime.datetime.fromtimestamp(mtime) You could also write that as: datetime.datetime.fromtimestamp( os.path.getmtime( path ) ) Ramit P This email is confidential and subject to important disclaimers and conditions including on offers for the purchase or sale of securities, accuracy and completeness of information, viruses, confidentiality, legal privilege, and legal entity disclaimers, available at http://www.jpmorgan.com/pages/disclosures/email. -- http://mail.python.org/mailman/listinfo/python-list
Re: date and time comparison how to
On Tue, Oct 30, 2012 at 3:20 PM, noydb jenn.du...@gmail.com wrote: But for the user supplied date... I'm not sure of the format just yet... testing with a string for now (actual date-date might be possible, tbd later), so like '10292012213000' (oct 29, 2012 9:30pm). How would you get that input into a format to compare with dt above? Instead of formatting your other date to match the input, turn the input into something you can easily manipulate - preferably, Unix time (seconds since 1970, sometimes referred to as a time_t). Once both your timestamps are integer (or float) seconds since a known epoch, they can be compared directly, as numbers. You're already pretty much there with strptime. Poke around with that and play with your format string and you should have it. But you may need to tweak it to match your actual input. ChrisA -- http://mail.python.org/mailman/listinfo/python-list
Re: date and time comparison how to
On 10/30/2012 12:20 AM, noydb wrote: On Monday, October 29, 2012 11:11:55 PM UTC-4, Dave Angel wrote: On 10/29/2012 10:13 PM, noydb wrote: I guess I get there eventually! snip okay, I see. But for the user supplied date... I'm not sure of the format just yet... testing with a string for now (actual date-date might be possible, tbd later), so like '10292012213000' (oct 29, 2012 9:30pm). How would you get that input into a format to compare with dt above? See http://docs.python.org/2/library/datetime.html There are a number of constructors for datetime. For example, now = datetime.datetime.now() spec = datetime.strptime(datstring, format) spec = datetime.datetime(year, month, day[, hour[, minute[, second[, microsecond) In each case, you have an optional tz for timezone. Or if possible, use utc versions of these functions to get greenwich times. tz is one of the biggest pains, and the quirks vary between operating systems and filesystems. If possible in your environment, use utcnow, utcfromtimestamp, etc. -- DaveA -- http://mail.python.org/mailman/listinfo/python-list
Re: date and time comparison how to
On 10/29/2012 04:13 PM, noydb wrote: All, I need help with a date and time comparison. Say a user enters a date-n-time and a file on disk. I want to compare the date and time of the file to the entered date-n-time; if the file is newer than the entered date-n-time, add the file to a list to process. How best to do? I have looked at the datetime module, tried a few things, no luck. Is os.stat a part of it? Tried, not sure of the output, the st_mtime/st_ctime doesnt jive with the file's correct date and time. ?? Any help would be appreciated! Use the datetime module (distributed with Python) to compare date/times. You can turn a filesystem time into a datetime with something like the following: import datetime, os, stat mtime = os.lstat(filename)[stat.ST_MTIME] // the files modification time dt = datetime.datetime.fromtimestamp(mtime) -- Dr. Gary Herron Department of Computer Science DigiPen Institute of Technology (425) 895-4418 -- http://mail.python.org/mailman/listinfo/python-list
Re: date and time comparison how to
On 2012-10-30 00:04, Gary Herron wrote: On 10/29/2012 04:13 PM, noydb wrote: All, I need help with a date and time comparison. Say a user enters a date-n-time and a file on disk. I want to compare the date and time of the file to the entered date-n-time; if the file is newer than the entered date-n-time, add the file to a list to process. How best to do? I have looked at the datetime module, tried a few things, no luck. Is os.stat a part of it? Tried, not sure of the output, the st_mtime/st_ctime doesnt jive with the file's correct date and time. ?? Any help would be appreciated! Use the datetime module (distributed with Python) to compare date/times. You can turn a filesystem time into a datetime with something like the following: import datetime, os, stat mtime = os.lstat(filename)[stat.ST_MTIME] // the files modification time dt = datetime.datetime.fromtimestamp(mtime) Instead of os.lstat(filename)[stat.ST_MTIME] you could use os.path.getmtime(filename). -- http://mail.python.org/mailman/listinfo/python-list
Re: date and time comparison how to
Thanks, I did find this... pdf_timeStamp = time.strftime(%m%d%y%H%M%S,time.localtime(os.path.getmtime(pdf))) pdf_timestamp '102909133000' ... but now how to do the comparison? Cannot just do a raw string comparison, gotta declare it a date -- http://mail.python.org/mailman/listinfo/python-list
Re: date and time comparison how to
if I do time.time() I get 1351562187.757, do it again I get 1351562212.2650001 --- so I can compare those, the latter is later then the former. Good. SO how do I turn pdf_timeStamp (a string) above into time in this (as from time.time()) format? Am I on the right track -- is that the way to do a time comparison? -- http://mail.python.org/mailman/listinfo/python-list
Re: date and time comparison how to
I guess I get there eventually! This seems to work pdf_timeStamp = time.strftime(%m%d%y%H%M%S,time.localtime(os.path.getmtime(pdf))) intermediateTime = time.strptime(pdf_timeStamp, %m%d%y%H%M%S) pdfFile_compareTime = time.mktime(intermediateTime) (and I'll do the same to the user entered date-n-time and then compare) Lastly, so can anyone chime in and tell me if this is a good method or not? Is there a better way? -- http://mail.python.org/mailman/listinfo/python-list
Re: date and time comparison how to
On 10/29/2012 10:13 PM, noydb wrote: I guess I get there eventually! This seems to work pdf_timeStamp = time.strftime(%m%d%y%H%M%S,time.localtime(os.path.getmtime(pdf))) intermediateTime = time.strptime(pdf_timeStamp, %m%d%y%H%M%S) pdfFile_compareTime = time.mktime(intermediateTime) (and I'll do the same to the user entered date-n-time and then compare) Lastly, so can anyone chime in and tell me if this is a good method or not? Is there a better way? Please read the rest of the thread in particular the message 3 hours ago from Gary Herron import datetime, os, stat mtime = os.lstat(filename)[stat.ST_MTIME] // the files modification time dt = datetime.datetime.fromtimestamp(mtime) Now you can compare two datetimes simply by if dt1 dt2: Or you can subtract them, and examine the difference. What's the need for all that string conversion stuff? -- DaveA -- http://mail.python.org/mailman/listinfo/python-list
Re: date and time comparison how to
On 2012-10-30 03:11, Dave Angel wrote: On 10/29/2012 10:13 PM, noydb wrote: I guess I get there eventually! This seems to work pdf_timeStamp = time.strftime(%m%d%y%H%M%S,time.localtime(os.path.getmtime(pdf))) intermediateTime = time.strptime(pdf_timeStamp, %m%d%y%H%M%S) pdfFile_compareTime = time.mktime(intermediateTime) (and I'll do the same to the user entered date-n-time and then compare) Lastly, so can anyone chime in and tell me if this is a good method or not? Is there a better way? Please read the rest of the thread in particular the message 3 hours ago from Gary Herron import datetime, os, stat mtime = os.lstat(filename)[stat.ST_MTIME] // the files modification time dt = datetime.datetime.fromtimestamp(mtime) Now you can compare two datetimes simply by if dt1 dt2: Or you can subtract them, and examine the difference. What's the need for all that string conversion stuff? +1 Incidentally, the best order for dates is year (4 digits - remember Y2K? :-)) then month then day. -- http://mail.python.org/mailman/listinfo/python-list
Re: date and time comparison how to
On Monday, October 29, 2012 11:11:55 PM UTC-4, Dave Angel wrote: On 10/29/2012 10:13 PM, noydb wrote: I guess I get there eventually! This seems to work pdf_timeStamp = time.strftime(%m%d%y%H%M%S,time.localtime(os.path.getmtime(pdf))) intermediateTime = time.strptime(pdf_timeStamp, %m%d%y%H%M%S) pdfFile_compareTime = time.mktime(intermediateTime) (and I'll do the same to the user entered date-n-time and then compare) Lastly, so can anyone chime in and tell me if this is a good method or not? Is there a better way? Please read the rest of the thread in particular the message 3 hours ago from Gary Herron import datetime, os, stat mtime = os.lstat(filename)[stat.ST_MTIME] // the files modification time dt = datetime.datetime.fromtimestamp(mtime) Now you can compare two datetimes simply by if dt1 dt2: Or you can subtract them, and examine the difference. What's the need for all that string conversion stuff? -- DaveA okay, I see. But for the user supplied date... I'm not sure of the format just yet... testing with a string for now (actual date-date might be possible, tbd later), so like '10292012213000' (oct 29, 2012 9:30pm). How would you get that input into a format to compare with dt above? -- http://mail.python.org/mailman/listinfo/python-list
