programmatically check if today is a market open trading day - stock

Question

What might be the simplest way to check if today the U.S. stock exchanges are open for trading?
The prolonged way I am hoping to avoid is by creating routines to parse a feed with calendar info like https://business.nasdaq.com/trade/US-Options/Holiday-Trading-Hours.html
I prefer Ruby, but even a simple URL lookup with curl to yield a true/false, or time until next market open, would be great.
OPTIONAL
To be able to lookup any arbitrary date would be better, and solve this too.
I.e. Even something like curl google.com/search?q="Is the NYSE open on $(date +%Y-%m-%d)" from the shell.

Answer 1

With Python, the easiest way I have found is using the pandas_market_calendars library, which tells you the market days.
import pandas_market_calendars as mcal
nyse = mcal.get_calendar('NYSE')
nyse.valid_days(start_date='2016-12-20', end_date='2017-01-10')
Substitute start_date, end_date for yourself and generate the follow range.
DatetimeIndex(['2016-12-20 00:00:00+00:00', '2016-12-21 00:00:00+00:00',
'2016-12-22 00:00:00+00:00', '2016-12-23 00:00:00+00:00',
'2016-12-27 00:00:00+00:00', '2016-12-28 00:00:00+00:00',
'2016-12-29 00:00:00+00:00', '2016-12-30 00:00:00+00:00',
'2017-01-03 00:00:00+00:00', '2017-01-04 00:00:00+00:00',
'2017-01-05 00:00:00+00:00', '2017-01-06 00:00:00+00:00',
'2017-01-09 00:00:00+00:00', '2017-01-10 00:00:00+00:00'],
dtype='datetime64[ns, UTC]', freq='C')
Check that the date today is in there.

Answer 2

I'm using Tradier's API to do this in my shell scripts, then using jq to get the status for a particular day.
date="your date"
month=$(date -d $date +%-m)
year=$(date -d $date +%Y)
calendar=$(curl -H "Authorization: Bearer "$tradierApi"" -H "Accept: application/json" "https://production-api.tradier.com/v1/markets/calendar?month="$month"&year="$year)
marketStatus=$(echo $calendar | ./jq-linux64 '.calendar.days.day[] | select(.date == "'$date'") | .status')

Answer 3

MSN quotes include a property indicating if the stock listing's market is open or closed:
https://www.msn.com/en-us/money/stockdetails/nas-aapl/fi-a1mou2?symbol=AAPL&form=PRMFPS
Below is an example Python script to get the status using the Beautiful Soup parser.
If you're worried about them changing their css, I suppose a regex might be more reliable, etc.
from bs4 import BeautifulSoup
import requests
session = requests.session()
response = session.get('https://www.msn.com/en-us/money/stockdetails/nas-aapl/fi-a1mou2?symbol=AAPL&form=PRMFPS')
if response.status_code == 200:
page = response.text
soup = BeautifulSoup(page, "lxml")
market = soup.find('span', attrs={'class': 'market-status-text'}).text
if market == 'US Markets Closed':
# do stuff
print('closed')
else:
print('open')
# do different stuff

Answer 4

Until something more elegant and reliable turns up, I might use
curl -s "https://www.isthemarketopen.com/" |grep -c "** Stock market is closed"
which returns a 1 in today's case (Good Friday)--and I can directly use in conditional code--but has to be maintained and checked periodically how that URL's underlying HTML source may have changed.

Answer 5

I found a Google Calendar of the USA market holidays which is reasonably updated for the next several years.
As much as I hate to add a separate answer, this is a much better solution than the brittle URL page text-searcher before (which btw, two weeks later is still returning "** Stock market is closed Good Friday 4/19/19" instead of simply having "market is open today" somewhere).
First the code: (Ruby w/ embedded Bash)
$marketCal = %x'curl -s "https://www.googleapis.com/calendar/v3/calendars/2jpqg4chp4djba5ea99b22b838#group.calendar.google.com/events?key=[YOUR GOOGLE API KEY]&maxResults=1&timeMin=#{today=`date +%Y-%m-%d`.chomp}T00%3A00%3A01%2B00%3A00&timeMax=#{today}T23%3A59%3A59%2B00%3A00&"'
$isMarketOpenToday = $marketCal !~ /"status":/ # => true when there exists event "id":, etc.
Since there are resource limits, you'll need to go and create your own free API key at
https://console.developers.google.com/apis/credentials?
The global variable $isMarketOpenToday yields true if there isn't a market holiday today, false otherwise. Note that it doesn't consider day of the week, so on weekends it may still yield true. So, just make that another simple test, if you need. Eg. [[ $(date +%u) < 6 ]] && echo "Weekday, yay!"
A lot could be improved with programming standards; the goal here was simply to test the API with minimal lines of code easily checked from the CLI outside a script, however nasty.

Answer 6

PowerShell:
function isMarketOpen(){
$url = "https://query2.finance.yahoo.com/v7/finance/quote?symbols=MSFT"
try{
$response = Invoke-RestMethod $url
#return $response.quoteResponse.result[0]
if($response.quoteResponse.result[0].marketState -eq 'CLOSED'){
return $false
}else{
return $true
}
}catch{
$_.exception | Write-Warning
return $null
}
}
isMarketOpen