What are the extended trading market hours during a partial trading day for US stocks

External question — Personal Finance Stack Exchange Author: KnowledgeSeeeker Original post: https://money.stackexchange.com/questions/133264 License: CC BY-SA 4.0 — https://creativecommons.org/licenses/by-sa/4.0/ Adaptation: HTML converted to plain text; contact email addresses removed. Day after thanksgiving and Christmas Eve are example for partial trading days for NYSE and NASDAQ exchanges. During these days, normal trading takes place from 9:30 AM EST to 1 PM EST. I searched but nowhere found what are the pre and post market hours for these partial trading day? I know during a normal trading day these hours are from 4AM to 9:30AM & 4PM to 8PM EST respectively. Thanks.

External answer — Personal Finance Stack Exchange Author: KnowledgeSeeeker Original post: https://money.stackexchange.com/a/134114 License: CC BY-SA 4.0 — https://creativecommons.org/licenses/by-sa/4.0/ Adaptation: HTML converted to plain text; contact email addresses removed. Finally I was able to find the answer. There is no change in the duration of pre and post market hours on a partial trading day. Pre market starts from 4 AM ends at 9:30 AM. Normal market starts at 9:30 and ends at 1 PM (because of partial trading day) Post market starts at 1 PM and ends at 5 PM.