gstat variogram with temporal data

I would like to build a temporal variogram. i have the data of a time series at my disposal. this time series was recorded at a measuring point. for each measured value the date is given on which it was measured (e.g. 09.02.1977). thus my data have only time as one dimension.
i have now noticed that gstat variogram() cannot work with temporal data formats. i had first thought about using time as a coordinate with x= date and y=1 in order to be able to work with the variogram() function. if i see this correctly, however, i cannot use data in a date format as coordinates.
Is there any other way to convert the respective date into coordinate format?

I added an example of my dataframe.

Thank you for your help!

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