The Publish At option that appears on the Publish Entry ... and the Unpublish Entry... dialog boxes allows you to publish or unpublish an entry either immediately or schedule it with the help of the Publish Now and Publish Later sub-options.
The Publish Now option publishes an entry immediately, and the Publish Later option allows you to publish an entry at a later date/time. When you select the Publish Later sub-option, you will be asked to select the date and time of publishing. On clicking this textbox, you will be prompted to enter the exact date, time (hour-min), and the timezone.
On selecting a timezone that follows daylight saving time (DST), Contentstack will display a help text at the bottom of the textbox that highlights the effective publishing date, time, and timezone along with DST adjustments. The effective publishing date specifies the publishing date in local time for the user publishing the entry.
Note: The DST time difference is one hour.