bson_iter_timestamp - Man Page

#define BSON_ITER_HOLDS_TIMESTAMP(iter) \
   (bson_iter_type ((iter)) == BSON_TYPE_TIMESTAMP)

void
bson_iter_timestamp (const bson_iter_t *iter,
                     uint32_t *timestamp,
                     uint32_t *increment);

• iter: A bson_iter_t.
• timestamp: A uint32_t.
• increment: A uint32_t.

The BSON_TYPE_TIMESTAMP type is not a date/time and is typically used for intra-server communication.

You probably want bson_iter_date_time().

The bson_iter_timestamp() function shall return the contents of a BSON_TYPE_TIMESTAMP element. It is invalid to call this function while observing an element that is not of type BSON_TYPE_TIMESTAMP.

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