I am creating a space time full data frame but having this error message:

Joining by: staidError in ST(sp, time, endTime) : time is not a time based class

the data frame 10 days average precip used looks like this:

     staid       time prec
1 38007200 1984-01-01  0.0
2 38008400 1984-01-01  0.8
3 38014000 1984-01-01  0.0
4 38008100 1984-01-01  0.0
5 38008700 1984-01-01  0.0
6 38009200 1984-01-01  0.0


The next date 1984-01-11 etc..

could someone help solve this urgent issue.

Best regards,

eus

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