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# PRTimeParamFn
This type defines a callback function to calculate and return the time
parameter offsets from a calendar time object in GMT.
## Syntax
```{code}
#include <prtime.h>
typedef PRTimeParameters (PR_CALLBACK_DECL *PRTimeParamFn)
(const PRExplodedTime *gmt);
```
## Description
The type {ref}`PRTimeParamFn` represents a callback function that, when
given a time instant in GMT, returns the time zone information (offset
from GMT and DST offset) at that time instant.