# Understanding Time Zone Implications in Callout/Hotspot Visibility The visibility of a Callout/Hotspot in a GRAVITY depends on several factors, the most important of which are time and time zones. Here we discuss the effects of time zone differences in this context. ## Server Time Zone - **Meaning of Date:** The selected date, which is chosen as the limit, is effectively meant to hide the Callout/Hotspot. The exact moment this date starts (at 00:00 hours), the Callout/Hotspot will be hidden. - **Time zone dependency:** The time used for this operation is based on the time zone of the underlying host, i.e. the time zone of the server. ## Client Time Zone When a user saves a Callout, the system considers the 'Client Time Zone' and calculates the difference to the 'Server Time Zone'. This difference is then stored. Based on this, we have the following scenarios: - **Same Time Zone Users:** For users who are in the same time zone as the original author of the Callout, the visibility (appearance/disappearance) of the Callout/Hotspot will be correct. That is, it will precisely follow the rules defined by the author. - **Different Time Zone Users:** For users in different time zones, there may be discrepancies in the visibility of the Callout/Hotspot. The appearance/disappearance timing may not be accurate, as it will vary based on the time zone difference between the user and the original author of the Callout. ## Time-Dependent Callouts/Hotspots in Form fields Besides grasping the effects of time zones, it's crucial to employ specific terminology within the system. During step 2 of the editing process and within the [[Goals]] section, the term 'valid till' accurately captures the visibility duration of the Callout/Hotspot. To precisely define the moment the Callout/Hotspot becomes invisible, the date is interpreted as follows: **Visible until the start of**. This option emphasizes the Callout/Hotspot will be visible until the specified date begins.