Mailman 3 - Datetime-SIG

Digital marketing class in chennai
by anto anto 03 Jun '24

03 Jun '24

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Check for non-existent datetime
by jbrockmendel＠gmail.com 21 Jan '23

21 Jan '23

Working on improving zoneinfo support in pandas, I want to check for non-existent datetimes. e.g. ``` from datetime import datetime, timezone import zoneinfo tz = zoneinfo.ZoneInfo("US/Pacific") dt = datetime(2014, 3, 9, 2, tzinfo=tz) # <- want to tell if this exists roundtrip = dt.astimezone(timezone.utc).astimezone(tz) if roundtrip != dt: raise ValueError("Nonexistent!") ``` Is checking for round-tripping a) correct and b) the suggested way of doing this?

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What is Marketing & Sponsorship?
by wisesam323＠gmail.com 12 Dec '22

12 Dec '22

Marketing & Sponsorship When you watch a TV truth show, I’m sure you’ve observed the anchors announce a series of names or at the least one company call as soon because the show starts offevolved or after the industrial spoil. They use these names after which claim that they sponsor the show. It can remain determined in TV suggests, track gala's, and wearing activities. In addition, numerous pinnacle businesses have forums wherein their merchandise remain discussed. The banners at rock concert events and different reliable occasions, as well as press releases, are all inside the same fashion Category. Another prime instance is the currently concluded World Cup. It, too, had steady flashes of pinnacle cell businesses and worldwide eateries on our displays. It is referred to as sponsorship marketing, which we will discuss later. If you are the owner of a first-rate employer, I am positive you've got received severa requests for sponsorship from faculties, schools, country wide-degree institutions, and social service businesses. It method you want to fund their training session of a sense of goodwill and a non-public schedule. It’s a win-win situation for each parties. Table of Contents Sponsorship Marketing Marketing Through Sponsorship Social Media and Sponsorship Marketing Conclusion: Sponsorship Marketing When you get hold of such offers, you need to do not forget whether the funding is worthwhile and whether or not you could achieve suitable benefits. You give the inexperienced light when you’ve met all the requirements and are glad with the outcomes. Sponsorship Marketing Thus, sponsorship marketing is simple but requires careful attention. Continue analyzing to learn about the fundamental idea and how it works in case you engage in sponsorship marketing. There are several forms of sponsorship advertising and marketing, so you need to be familiar with them all. Now which you’ve read approximately such a lot of examples, I’m sure you have got a terrific idea of how it’s meant to stay achieved. But what hasn’t remained mentioned is how it's going to in the end help the agency earn money. After all, it is a advertising strategy, and the aim of any advertising and marketing method is to boom income in order that the organization’s income will increase.@https://www.worldwidewebblog.com/marketing-sponsorship/

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Trouble to resolve a timezone offset to get correct UTC time
by Pierre 04 Jun '22

04 Jun '22

Hello, I am sorry, I am kind of lost and I would be really grateful to receive some help. Basically, I have a list of timestamps expressed as a strings as below, and I would like them expressed in UTC. But there seems to be a trouble during the offset, which is applied the other way round. The input timestamps look like: 0 'Sat Mar 30 2019 21:00:00 GMT+0100' Adding them in a panda dataframe with to_datetime function, they read then: GC['Time'] = pd.todatetime(my_timestamps) GC['Time'] 0 2019-03-30 21:00:00-01:00 If I further ask: GC['Time'][0] datetime.datetime(2019, 3, 30, 21, 0, tzinfo=tzoffset(None, -3600)) It seems, AFAIK, OK. But then if I want to resolve the offset so as to have time expressed in UTC time, I get: GC['Test'] = pd.to_datetime(GC['Time'],utc=True) 0 2019-03-30 22:00:00+00:00 The offset has bee applied the other way round. Correct timestamp in UTC would be 20:00:00 Please, what should I do to have these timestamps correctly expressed in UTC time? I thank you in advance for your help. I am so sorry to intrude the mailing list with this question, but I am unable to move forward from this point. I thank you again, Bests, Pierre

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strptime and %Z
by Eugene Triguba 24 Apr '22

24 Apr '22

Should `strptime`, when passed a %Z format specifier, parse more than just GMT, UTC, and the local time zone given that we now have the IANA database in the stdlib via PEP 615 since Python 3.9? The regex for the %Z specifier appears to come from TimeRE and always has GMT, UTC, and then the local time zone. >>> from _strptime import TimeRE >>> t = TimeRE() >>> t['Z'] '(?P<Z>cst|gmt|utc|cdt)' >>> from datetime import datetime >>> datetime.strptime('2016-12-04 08:00:00 CST', '%Y-%m-%d %H:%M:%S %Z') datetime.datetime(2016, 12, 4, 8, 0) >>> datetime.strptime('2016-12-04 08:00:00 CDT', '%Y-%m-%d %H:%M:%S %Z') datetime.datetime(2016, 12, 4, 8, 0) >>> datetime.strptime('2016-12-04 08:00:00 UTC', '%Y-%m-%d %H:%M:%S %Z') datetime.datetime(2016, 12, 4, 8, 0) >>> datetime.strptime('2016-12-04 08:00:00 GMT', '%Y-%m-%d %H:%M:%S %Z') datetime.datetime(2016, 12, 4, 8, 0) >>> datetime.strptime('2016-12-04 08:00:00 EST', '%Y-%m-%d %H:%M:%S %Z') Traceback (most recent call last): File "<stdin>", line 1, in <module> File "/usr/home/eugene/src/cpython/Lib/_strptime.py", line 568, in _strptime_datetime tt, fraction, gmtoff_fraction = _strptime(data_string, format) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/usr/home/eugene/src/cpython/Lib/_strptime.py", line 349, in _strptime raise ValueError("time data %r does not match format %r" % ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ ValueError: time data '2016-12-04 08:00:00 EST' does not match format '%Y-%m-%d %H:%M:%S %Z' There have been some discussions and issues with regard to this in the past: - https://github.com/python/cpython/issues/66571 - https://github.com/python/cpython/issues/66616 I was interested in taking a look at this, but I wanted to reach out and know if it was something that would be desirable and what others' thoughts were. Thanks, Eugene

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should utcnow and utcfromtimestamp return tz-aware?
by Brock Mendel 30 Dec '21

30 Dec '21

This has come up in pandas.Timestamp (which subclasses datetime). The issue is internal consistency and round-trips. Intuitively, we would expect: ``` a = datetime.utcnow() b = a.timestamp() c = datetime.utcfromtimestamp(b) assert a == b ``` but this fails. (Note: it works for `datetime.now()` with `datetime.fromtimestamp()`, though that is partially because of weird-to-me behavior of `timestamp()` for naive datetimes). It would succeed if utcnow and utcfromtimestamp returned tz-aware datetime objects. Thoughts?

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Hi there!
by alice.hilligan＠protonmail.com 22 Jun '21

22 Jun '21

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PEP 615: Support for the IANA Time Zone Database
by Paul Ganssle 25 Feb '20

25 Feb '20

Greetings, Last year at the Language Summit, I proposed to add additional concrete time zones to the standard library ( https://pyfound.blogspot.com/2019/05/paul-ganssle-time-zones-in-standard.ht… ). After much work and much more procrastination, I now have now put together my first proposal: support for the IANA time zone database (also called tz, zoneinfo or the Olson database). I have submitted this for consideration as PEP 615 ( https://www.python.org/dev/peps/pep-0615/ ), and I have created a discussion thread for the PEP on the discourse forum ( https://discuss.python.org/t/pep-615-support-for-the-iana-time-zone-databas… ). Please give it a read and provide your constructive criticism. I have documented my reasoning for most of the design decisions, but I am very interested in getting feedback on the choices I’ve made here. I have marked two sections as “Open issues”, as they are the ones I feel most uncertain about, but all parts of it are up for discussion. For the purposes of centralizing discussion, please direct comments to the discourse thread <https://discuss.python.org/t/pep-615-support-for-the-iana-time-zone-databas…>. _*Links for easy access:*_ *Discussion:* https://discuss.python.org/t/3468 *PEP:* https://www.python.org/dev/peps/pep-0615/ *Reference Implementation:* https://github.com/pganssle/zoneinfo *tzdata repo:* https://github.com/pganssle/tzdata (Note: At some point I plan to move the tzdata repo to github.com/python/tzdata; if the reference implementation turns into a backport that will likely also move to an org as well). Thanks for your consideration! Paul

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hashability of tzinfo objects
by Brock Mendel 16 Apr '19

16 Apr '19

This is tied in with the equality semantics of these objects, has come up here, in the dateutil tracker, and in pandas: https://mail.python.org/archives/list/datetime-sig@python.org/thread/45P3EX… / <https://mail.python.org/archives/list/datetime-sig@python.org/thread/45P3EX…> https://github.com/dateutil/dateutil/issues/835 https://github.com/dateutil/dateutil/issues/792 https://github.com/pandas-dev/pandas/pull/24006#discussion_r238483612 My understanding is that hashing cannot be implemented until/unless equality is changed. Is that accurate? Is there a compelling reason for these _not_ to be hashable?

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Proposal: date.fromisocalendar
by Paul Ganssle 05 Apr '19

05 Apr '19

Some time ago, I posted a bpo-36004 <https://bugs.python.org/issue36004>, proposing the addition of a `date.fromisocalendar` alternate constructor, and the corresponding PR #11888 <https://github.com/python/cpython/pull/11888> implementing it. This function is the inverse of `date.isocalendar`. I think that, whenever possible, if we have a function that serializes a date or datetime, we should have a conjugate function that constructs a date/datetime from the output; the big one of these was `datetime.fromisoformat`, which was added in Python 3.7, but I have noticed that `isocalendar` also does not currently have an inverting function, and I'd like to add that for Python 3.8. It has been finished for a while, but I would like some additional review of both the idea and implementation, so I'd like to bring it to the attention of the list. Best, Paul

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