daylight | The answer to your daylight related questions | Machine Learning library

by adonmo C++ Version: 0.1.3 License: MIT

X-Ray Key Features Code Snippets(3)Community Discussions(10)Vulnerabilities Install Support

kandi X-RAY | daylight Summary

daylight is a C++ library typically used in Artificial Intelligence, Machine Learning, Deep Learning, Numpy, Pandas applications. daylight has no bugs, it has no vulnerabilities, it has a Permissive License and it has low support. You can download it from GitHub.

daylight or libdaylight is a library which enables you to answer daylight related questions like:. The math used in this library is mostly based on NOAA's solar calculations, which were in turn based on Astronomical Algorithms, by Jean Meeus. Also thanks to this Python implementation of these calculations by Michel Landers, which was a very useful reference while building this library. libdaylight is written in modern C++ with bindings to python using pybind11. daylight's python bindings provide vectorized functions - allowing for efficient analysis when dealing with lots of queries. At the same, this allows daylight to play well with established data science tooling like numpy and pandas. ️ Currently this library is only tested for basic use cases. For any scientific-grade use cases, or for cases where precise values are needed - this library is not extensively tested, yet. Any contributions from that aspect would be greatly appreciated.

Support

Quality

Security

License

Reuse

Support

daylight has a low active ecosystem.

It has 9 star(s) with 0 fork(s). There are 1 watchers for this library.

It had no major release in the last 12 months.

daylight has no issues reported. There are no pull requests.

It has a neutral sentiment in the developer community.

The latest version of daylight is 0.1.3

Quality

daylight has no bugs reported.

Security

daylight has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

License

daylight is licensed under the MIT License. This license is Permissive.

Permissive licenses have the least restrictions, and you can use them in most projects.

Reuse

daylight releases are not available. You will need to build from source code and install.

Installation instructions are not available. Examples and code snippets are available.

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daylight Key Features

No Key Features are available at this moment for daylight.

daylight Examples and Code Snippets

Usage,Python,Code sample

C++

Lines of Code : 37

License : Permissive (MIT)

Copy

import datetime
import pytz

import daylight

def epoch(year, month, day, hour=0, minute=0, second=0, tz=pytz.UTC):
    return int(tz.localize(datetime.datetime(year, month, day, hour, minute, second)).timestamp())

tz = pytz.timezone("Asia/Kolkata")

Usage,C++

C++

Lines of Code : 18

License : Permissive (MIT)

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#include 
#include 

using namespace std;


int main() {
    // Coordinates and Timezone offsets for Hyderabad
    Sunclock sun(17.3859, 78.4867, 5.5);

    // Unix timestamp for 2020-5-21 14:10:35
    auto irradiance = sun.irradiance(1590050435);

Usage,C

C++

Lines of Code : 16

License : Permissive (MIT)

Copy

#include "daylight_c.h"
#include 

int main(int argc, char* argv[]) {
    struct Sunclock* s = newSunclock(17.3859, 78.4867, 5.5);
    time_t t_20200521141035 = 1590050435;
    double irradiance = Sunclock_irradiance(s, t_20200521141035);
    printf(

Community Discussions

Trending Discussions on daylight

How to extract the hour of day from a timestamp by hand?

How to get real time zone offset taking into account daylight saving?

Creating a date from a string in Javascript shows incorrect date

What does time_since_epoch() actually represent in a std::chrono::local_time?

Pass timezone from Angular app to ASP.NET Core 3.1 backend

What is the difference between TimeZoneInfo.Local and FindSystemTimeZoneById?

Creating a time.Duration from float64 seconds

I'm unable to get the right timezone offset with daylight

PHP - 12 hour format with daylight savings adjustments

How to convert local time to UTC, considering daylight saving time?

QUESTION

How to extract the hour of day from a timestamp by hand?

Asked 2021-Jun-12 at 08:00

No, I'm not trying to do this in any particular language. If all you have is math, is it possible to extract the hour of day from a timestamp, if so how?

Example

Here's a sample timestamp 1602934899. The expected output (the hour in that timestamp) is 11.

Edit

I'm trying to accomplish this without any libraries. Also, I'm aware of leap seconds and I don't care about the lack of precision that may be caused if I ignore it for my purposes. I also don't care for leap years or timezones or daylight savings time.

...

ANSWER

Answered 2021-Jun-11 at 21:40

Depending on what you want to achieve, there are a way broad to parse full date into hour format. For exemple, you can use MomentJs javascript library to format date. If your database previously stored the timestamp or datetime value as a full date i.e (day, month, year, hour, minute, and second), then you can parse into whatever you want to extract. first import moment like so:

Source https://stackoverflow.com/questions/67943550

QUESTION

How to get real time zone offset taking into account daylight saving?

Asked 2021-Jun-11 at 18:13

I am in +3 timezone now.
Now UTC time is 16:30 and at my place it is 19:30

I found an issue that for time zone America/Los_Angeles

which is theoretically -8 (rawOffset) I get unexpected time. I expected that if in my place 20:00, then at ths timezoe time should be 11 hours less(8+3) but in real life it is 10 hours less than in my place because of daylight saving.

So how can I get -7 offset if I have America/Los_Angeles zoneId in my code ?

...

ANSWER

Answered 2021-Jun-11 at 18:13

If you need to know the time zone offset that is correctly adjusted for DST, don't use getRawOffset(), since that is specifically the offset without DST. As the documentation says it:

Returns the amount of time in milliseconds to add to UTC to get standard time in this time zone. Because this value is not affected by daylight saving time, it is called raw offset.

To know if DST is in effect, the system needs to know the date, not just the time. If you know the full date/time, then you can get the offset by calling e.g. getOffset(long date).

To get the time zone offset in effect right now, call:

Source https://stackoverflow.com/questions/67940604

QUESTION

Creating a date from a string in Javascript shows incorrect date

Asked 2021-Jun-04 at 03:11

I have this string which I want to create a date from :

Wed Jun 16 2021 00:00:00 GMT+0300 (Israel Daylight Time)

Now when I try to make a new date from it :

...

ANSWER

Answered 2021-Jun-04 at 03:11

It has to do something with Timezone. Check out https://en.wikipedia.org/wiki/ISO_8601.

Your time is 0:00 of 16, after adjusting to the timezone that is UTC, the time is 21:00 of 15. There is a 3 hours difference because of GMT+0300.

Source https://stackoverflow.com/questions/67819706

QUESTION

What does time_since_epoch() actually represent in a std::chrono::local_time?

Asked 2021-Jun-03 at 23:01

I'd like to serialize a std::chrono::local_time by sending it's time_since_epoch().count() value. My question is how is a non-C++ receiver supposed to interpret that value? Is it the actual number of ticks since the epoch at local midnight (1970-01-01T00:00:00)? What about daylight saving time changes? Is the time_since_epoch() bijective with the wall clock time? That is, can there be two values of std::chrono::local_time::time_since_spoch() that represent the same wall clock/calendar time?

I cannot find detailed information about the interpretation of std::chrono::local_time::time_since_spoch() at the usual places: cppreference, the latest C++ standard draft, or Howard Hinnant's date library documentation.

'Why even serialize a std::chrono::local_time?', you may ask. Well, a use case would be a building automation system that must perform a certain task at a given local time on a special day, regardless of timezones or daylight saving time. For example, "turn off the lights at 20:00 local time on Earth Day, 2021 (April 22).

EDIT: 'Why not serialize it as an ISO8601 date/time (without any offset), you may ask?'. I want to serialize it as a compact number using a binary protocol, such as CBOR.

...

ANSWER

Answered 2021-Jun-03 at 23:01

The value in a local_time is the exact same value it would have in a sys_time. For example:

Source https://stackoverflow.com/questions/67829275

QUESTION

Pass timezone from Angular app to ASP.NET Core 3.1 backend

Asked 2021-Jun-02 at 17:11

I am trying to get appointments that are saved with UTC times filtered by e.g. the date. The problem is an appointment can be saved for UTC June 1st 10:00 PM, but when the user is located in Germany, that would be June 2nd 12:00 AM for that user's local time. When the user requests all appointments for June 1st that appointment should not appear, but when June 2nd is requested, it should.

As long as the backend doesn't know which timezone to apply, it will behave the other way around.

I am aware of ToLocalTime() in the backend, but as for my understanding that will only behave correctly as long as the client is in the same timezone as the server.

One might say, that I could use getTimezoneOffset() on the client side and pass it to the backend in some way. But that won't work, because of daylight savings. UTC December 1st 10:00 PM would result in a German local time of December 1st 11:00 PM, so applying the current timezone offset doesn't help.

I figured out, that most browsers will support Intl.DateTimeFormat().resolvedOptions().timeZone to get the timezone as a text. But passing that one to the backend didn't help either, because when I check the list of supported timezones returned by TimeZoneInfo.GetSystemTimeZones() in the backend, I can't find the same string as the browser provides. (browser returns 'Europe/Berlin', Id in backend is 'W. Europe Standard Time', other strings are even localized)

I know that I'm exhausted a bit, because working with dates and times was a reoccuring theme for me today, but am I missing out on something obvious? What can I do to make the backend aware of the relevant timezone? And how would I get the DateTime for that specific timezone?

...

ANSWER

Answered 2021-Jun-02 at 17:11

You're on the right track with regard to time zone conversion:

In the browser, get an IANA time zone identifier:

Source https://stackoverflow.com/questions/67807860

QUESTION

What is the difference between TimeZoneInfo.Local and FindSystemTimeZoneById?

Asked 2021-Jun-01 at 03:08

I know time and timezones is a difficult issue, yet I'm still confused by the following:

...

ANSWER

Answered 2021-May-31 at 13:09

From the comments you approved, that the SupportsDaylightSavingTime of the TimeZoneInfo, which was received by: TimeZoneInfo.Local is false.

This depends on your machine settings. From the docs:

The value of the SupportsDaylightSavingTime property for the local time zone returned by the TimeZoneInfo.Local property reflects the setting of the Control Panel Date and Time application's checkbox that defines whether the system automatically adjusts for daylight saving time. If it is unchecked, or if no checkbox is displayed for a time zone, the value of this property is false.

This is the only obvious difference between the two methods you used.

Source https://stackoverflow.com/questions/67773949

QUESTION

Creating a time.Duration from float64 seconds

Asked 2021-May-29 at 01:05

I have a float64 containing a duration in seconds. I'm looking for a way to convert this value to a time.Duration. I'm able to perform this conversion, but I'm wondering if there is not a more elegant way.

The approach I have is this:

...

ANSWER

Answered 2021-May-28 at 13:21

Im not sure what the issue is here. Your request is very simple to implement:

Source https://stackoverflow.com/questions/67726230

QUESTION

I'm unable to get the right timezone offset with daylight

Asked 2021-May-28 at 16:41

I'm stuck with the daylight problem in android the time should be +3 GMT/UTC but I'm getting only +2. is there any solution or I can't handle it? please find below my code

...

ANSWER

Answered 2021-May-28 at 16:41

java.time

Consider using java.time, the modern Java date and time API, for your date and time work. Let’s first declare a formatter for your desired time format:

Source https://stackoverflow.com/questions/67740883

QUESTION

PHP - 12 hour format with daylight savings adjustments

Asked 2021-May-25 at 20:01

I am having trouble finding a way to display a time accounting for daylight savings changes. This script is supposed to return the time for Dusk on any specified date at a specific place in the Eastern time zone. It works, but, it doesn't give the correct time in the winter (it's off by an hour). I've tried a variety of ways to deal with it, but nothing seems to work. I thought that simply setting the timezone to NY would do it, but it's still wrong. Help?

...

ANSWER

Answered 2021-May-25 at 20:01

date_sunset() with SUNFUNCS_RET_STRING returns only the time portion, eg: 22:51 so when you feed only that into the DateTime constructor it assumes that you want all the rest of the details filled in with the current values. So you're applying some other date's sunset to today's TZ values with differing DST, eg: UTC-4 vs UTC-5.

I would suggest using SUNFUNCS_RET_TIMESTAMP, an also going all-in with the DateTime library.

Source https://stackoverflow.com/questions/67694135

QUESTION

How to convert local time to UTC, considering daylight saving time?

Asked 2021-May-23 at 17:33

I have datetime values in local time zone, and I need to convert them into UTC. How can I do this conversion for historical records, considering daylight saving time in the past?

...

ANSWER

Answered 2021-May-23 at 17:20

First, check your conversion value, here, in PDT, Universal is 5 hours behind, so convert accordingly, as for checking if its daylight savings time, write an if statement checking the date, and month and convert accordingly. Does this help?

Source https://stackoverflow.com/questions/67662466

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