Can you give us a little more detail as to what exactly you are trying to do? Are you trying to use the Time BAsed Publishing service for your news content with a Valid From/Valid To date?
If so then you need to create a timestamp control in your form and link the Lifetime properties, Valid From, Valid Until, in the Data model to this control. For a better understanding go through this How-To guide:
The timestamp control enables the input of the date and time. You can use this control to create u2018valid fromu2019 and u2018valid untilu2019 fields in order to restrict the lifetime of objects for time-based publishing.
You can refer to this help links for more details .
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