By default, a calendar view will have one header above each column, with a default value based on the duration of the column. If you want to deviate from this default, you can use Time Headers. For example, you can create a week view with columns that span one hour, and a double time header: one for the day and one for each hour. This is shown in the screenshot below.

Create a Time Header

Navigate to the View record for which you want to modify the time headers.
Go to the Time Headers related list.
Click New.
Fill out the details for the Time Header. For more detailed information on each field, see the Time Header field information table at the bottom of this article.
Click Save.
The time header should now appear for this View.

The Slot Label Format field on view is overwritten by time headers. If you want to add a time header that uses the Slot Label Format, pick 'Cell' for the Grouping.

Time Header field information

Field name	Description
Time Header Name	The name of the Time Header. Descriptive names make it easier to identify them.
Grouping	The amount of time that one Header will span on the calendar. Available options are: Cell: the same size as one cell on the calendar. Hour: one hour. Day: one day. Week: one week, leave the Header Label Format empty for week numbers. Month: one month. Quarter: one quarter, leave the Header Label Format empty for Q1, Q2 etc.
Header Label Format	The text that is displayed in the label of each time column. You can use the following formats: Date & Time Format Tokens
View	The View this time header is displayed on.
Order	The order that the time headers are displayed in with the lowest number at the top.
Current Time Highlight Color	The background color of the timeheader if the current time falls inside of the range it spans. Will be prioritised over Weekend Highlight Color
Weekend Highlight Color	The background color of the timeheader if the range contains either Saturday or Sunday.

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Customise the Reservation fields shown on the calendar and hovers
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Set up Calendars & Views
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Dynamic Dimension Grouping
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Time Headers
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Defining Reservation Titles

Create a Time Header

Time Header field information

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