when options expire end or beginning of day

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https://www.powercycletrading.com/what-time-do-options-expire/

What Time Do Options Expire? – Power Cycle Trading

What Time Do Options Expire?

Generally, the last opportunity to trade a monthly options contract is shortly after market close on the third Friday of the expiration month. This can be a little confusing, however, since the actual time that that an option expires is the next day (Saturday). The expiration time and expiration date for an options contract are different.

https://www.investopedia.com/ask/answers/09/option-expiration-date-profits.asp

Holding an Option Through the Expiration Date
https://www.investopedia.com/ask/answers/09/option-expiration-date-profits.asp
As an option approaches expiry, there are three choices to be made: sell the option, exercise the option, or let the expiration expire. Out-of-the-money options expire worthless. In-the-money …

https://www.projectoption.com/options-expiration-ultimate-guide/

Options Expiration | When Do Options Expire? | projectoption
https://www.projectoption.com/options-expiration-ultimate-guide/
Standard options expiration occurs on the third Friday of each month. As a result, the last day to trade options in the standard monthly cycles is the third Friday of each month, which will be between the 15th and 21st day of the month.

https://www.theoptionsguide.com/expiration-date.aspx

Options Expiration Explained | The Options & Futures Guide
https://www.theoptionsguide.com/expiration-date.aspx
For all stock options listed in the United States, the expiration date falls on the third Friday of the expiration month (except when that Friday is also a holiday, in which case it will be brought forward by one day to Thursday).

https://finance.zacks.com/expiration-day-mistakes-avoid-options-10624.html

Expiration Day Mistakes to Avoid with Options | Finance …
https://finance.zacks.com/expiration-day-mistakes-avoid-options-10624.html
Weekly options expire every Friday and monthly options expire the third Friday of each month. Option trading can be volatile and unpredictable on expiration day. You can protect your trading…

https://www.investopedia.com/terms/e/expiration-time.asp

Expiration Time Definition
https://www.investopedia.com/terms/e/expiration-time.asp
Typically, the last day to trade an option is the third Friday of the expiration month, but the actual expiration time is often not until the next day (Saturday). Derivative contracts will specify…

https://www.marketwatch.com/optionscenter/calendar

Options Expiration Calendar 2021 – MarketWatch
https://www.marketwatch.com/optionscenter/calendar
Options Expiration Calendar 2021. 2020 … after first non-bullish analyst starts coverage. 3. … Historical and current end-of-day data provided by FACTSET. All quotes are in local exchange time.

https://www.reddit.com/r/investing/comments/6ifds9/do_options_expire_at_the_end_of_the_day/

Do options expire at the end of the day? : investing

Do options expire at the end of the day?
byu/Startupsallday ininvesting

It expires at 4pm Eastern time when the market closes. I once had an option that was worthless at 4 pm. The company announced some good news after the market closed. Stock shot up in the after hours.

https://investingwithoptions.com/options-expiration/

Options Expiration Explained | Investing With Options

Options Expiration Explained

Technically, expiration occurs on Saturday. That’s when settlement actually occurs. But since the market’s don’t actually trade on Saturday, we treat Friday as the effective expiration date. For monthly option contracts, the expiration is the Third Friday of each month.

https://www.reddit.com/r/RobinHood/comments/8832km/what_time_do_calls_expire_on_the_expiry_date/

What time do calls expire on the expiry date? : RobinHood

What time do calls expire on the expiry date?
byu/b_r_e_a_k_f_a_s_t inRobinHood

Options cannot be traded after the last market close before expiry. However, they may be exercised after market close. Options must be exercised by 5:30 PM the day of expiry.