what is the timezone that yahoo uses for stock information
"Using your example link, I found the corresponding chart for a stock that trades on London Stock Exchange: https://ca.finance.yahoo.com/echarts?s=RIO.L#symbol=RIO.L;range=1d As you can see there, the chart runs from ~8:00am to ~4:30pm, and as I write this post it is only 2:14pm Eastern Time.  So clearly this foreign chart is using a foreign time zone.  And as you can see from this Wikipedia page, those hours are exactly the London Stock Exchange's hours. Additionally, the closing price listed above the graph has a timestamp of ""11:35AM EST"", meaning that the rightmost timestamp in the graph (~4:30pm) is equal to 11:35AM EST.  16:30 - 11:30 = 5 hours = difference between London and New York at this time of year. So those are two data points showing that Yahoo uses the exchange's native time zone when displaying these charts."
On Monday, the 27th of June 2011, the XIV ETF underwent a 10:1 share split. The Yahoo Finance data correctly shows the historic price data adjusted for this split.  The Google Finance data does not make the adjustment to the historical data, so it looks like the prices on Google Finance prior to 27 June 2011 are being quoted at 10 times what they should be.   Coincidentally, the underlying VIX index saw a sudden surge on the Friday (24 June) and continued on the Monday (27 June), the date that the split took effect.  This would have magnified the bearish moves seen in the historic price data on the XIV ETF. Here is a link to an article detailing the confusion this particular share split caused amongst investors.  It appears that Google Finance was not the only one to bugger it up.  Some brokers failed to adjust their data causing a lots of confusion amongst clients with XIV holdings at the time. This is a recurring problem on Google Finance, where the historic price data often (though not always) fails to account for share splits. The difference is that Yahoo is showing the unadjusted price that the security traded for on that date, while google is adjusting for price splits. This means that Google is showing how much you would have had to pay to get what is now one share. Since 1979, JNJ has split 3-for-1 once, and 2-for-1 four times. 3x2x2x2x2 = 48. If you bought 1 share at that time, you would now have 48 shares today. Yahoo is showing a price of $66 for what was then 1 share. $66/48 = 1.375, which Google rounds to 1.38. You can see this if you get the prices from May 14-21, 1981. The stock split 3-for-1, and the price dropped from 108 to 36.38. Yahoo's adjusted close column has not been accurate since they re-wrote the Finance website. It now just represents the closing price. The other relevant field on Yahoo is the Adj. Close. This adjusts for splits, but also adjusts for dividends. Hence why this doesn't match either the Google or Yahoo numbers. 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Are you talking a Real Time Level II quote or just a delayed quote?  Delayed quotes could vary as different companies would be using different time points in their data.  You aren't specifying exactly what kind of quote from which system are you using here. The key to this question is how much of a pinpoint answer do you want and how prepared are you to pay for that kind of access to the automated trades happening?  Remember that there could well be more than a few trades happening each millisecond and thus latency is something to be very careful here, regardless of the exchange as long as we are talking about first-world stock exchanges where there are various automated systems being used for trading. Different market makers is just a possible piece of the equation here.  One could have the same market maker but if the timings are different,e.g. if one quote is at 2:30:30 and the other is at 2:30:29 there could be a difference given all the trades processed within that second, thus the question is how well can you get that split second total view of bids and asks for a stock.  You want to get all the outstanding orders which could be a non-trivial task. "I believe you are looking for price forecasts from analysts. Yahoo provides info in the analyst opinions section: here is an example for Apple the price targets are located in the ""Price Target Summary"" section." According to Active Equity Management by Zhou and Jain: When a stock pays dividend, the adjusted price in Yahoo makes the following adjustment: Let T be the ex-dividend date (the first date that the buyers of a stock will not receive the dividend) and T-1 be the last trading day before T. All prices before T are adjusted by a multiplier (C_{T-1} - d_T)/C_{T-1}, where C_{T-1} is the close price at T-1 and d_T is the dividend per share. This, of course means that the price before T decreases. The dividend is for a quarter of the year, three months. 80 cents is 3.9% of $20.51. Presumably the Div/yield changes as the stock price changes. On Yahoo, they specify that the yield is based on a particular stated date. So it's only the exact number if the stock trades at the price on that date. Is it possible that mutual funds account for a significant portion of this volume. Investors may decide to buy or sell anytime within a 24 hour period, but the transaction only happened at the close of the market. Therefore at 3:59 pm the mutual fund knows if they will be buying or selling stocks that day.  As nws pointed out the non-market hours are longer and therefore accumulate more news event. Some financial news is specifically given during the time the market is closed. Therefore the reaction to that news has to either be in the morning when the market opens or in the late afternoon if they are trying to anticipate the news.  Also in the US market the early morning trader may be reacting to European market activities. Still working on exact answer to question....for now: (BONUS) Here is how to pull a graphical chart with the required data: Therefore: As r14 = the indicator for RSI.  The above pull would pull Google,   6months, line chart, linear, large, with a 50 day moving average, a   200 day exponential moving average, volume, and followed up with RSI. Reference Link:  Finance Yahoo! API's "Google Finance certainly has data for Tokyo Stock Exchange (called TYO on Google) listings.  You could create a ""portfolio"" consisting of the stocks you care about and then visit it once per day (or write a script to do so)." I will be messaging you on [**2021-09-15 15:26:20 UTC**](http://www.wolframalpha.com/input/?i=2021-09-15 15:26:20 UTC To Local Time) to remind you of [**this link.**](https://www.reddit.com/r/business/comments/708rox/alphabet_is_reportedly_considering_investing_1/dn1namt)  [**CLICK THIS LINK**](http://np.reddit.com/message/compose/?to=RemindMeBot&amp;subject=Reminder&amp;message=[https://www.reddit.com/r/business/comments/708rox/alphabet_is_reportedly_considering_investing_1/dn1namt]%0A%0ARemindMe!  4 years) to send a PM to also be reminded and to reduce spam.  ^(Parent commenter can ) [^(delete this message to hide from others.)](http://np.reddit.com/message/compose/?to=RemindMeBot&amp;subject=Delete Comment&amp;message=Delete! dn1nba9)  _____  |[^(FAQs)](http://np.reddit.com/r/RemindMeBot/comments/24duzp/remindmebot_info/)|[^(Custom)](http://np.reddit.com/message/compose/?to=RemindMeBot&amp;subject=Reminder&amp;message=[LINK INSIDE SQUARE BRACKETS else default to FAQs]%0A%0ANOTE: Don't forget to add the time options after the command.%0A%0ARemindMe!)|[^(Your Reminders)](http://np.reddit.com/message/compose/?to=RemindMeBot&amp;subject=List Of Reminders&amp;message=MyReminders!)|[^(Feedback)](http://np.reddit.com/message/compose/?to=RemindMeBotWrangler&amp;subject=Feedback)|[^(Code)](https://github.com/SIlver--/remindmebot-reddit)|[^(Browser Extensions)](https://np.reddit.com/r/RemindMeBot/comments/4kldad/remindmebot_extensions/) |-|-|-|-|-|-| IESC has a one-time, non-repeatable event in its operating income stream.  It magnifies operating income by about a factor of five.  It impacts both the numerator and the denominator.  Without knowing exactly how the adjustments are made it would take too much work for me to calculate it exactly, but I did get close to their number using a relatively crude adjustment rule. Basically, Yahoo is excluding one-time events from its definitions since, although they are classified as operating events, they distort the financial record.  I teach securities analysis and have done it as a profession.  If I had to choose between Yahoo and Marketwatch, at least for this security, I would clearly choose Yahoo. I was recently at the National Physical Laboratory in the UK and discussing exactly this.  By January 2018 financial institutes will be legally required to time stamp all transactions (including high frequency trades) with a UTC time code.  Today this is almost exclusively done using GPS satellite time and as the OP states - these can be spoofed but also are vulnerable to certain weather conditions.  One of the many innovations of NPL in their recent diversification includes sending ‘time’ into the city by  optical fibre which is ‘gold standard and cannot be tampered with’.  Very interesting topic ( I thought )! Should be noted that pacoverflow's answer is wrong. Yahoo back-adjusts all the previous (not current or future) values based on a cumulative adjustment factor. So if there's a dividend ex-date on December 19, Yahoo adjusts all the PREVIOUS (December 18 and prior) prices with a factor which is: 1 - dividend / Dec18Close 3:44 PM EDT happens when this comment is 4 hours and 23 minutes old.  You can find the live countdown here: https://countle.com/PIo16101q  ---  I'm a bot, if you want to send feedback, please comment below or send a PM.