get_prior_timestamp# API documentation for tradingstrategy.utils.time.get_prior_timestamp Python function. get_prior_timestamp(series, ts)[source]# Get the first timestamp in the index that is before the given timestamp. Returns: Any timestamp from the index that is before or at the same time of the given timestamp. Return None if there are no earlier timestamps. Parameters: series (Series) – ts (Timestamp) – Return type: pandas._libs.tslibs.timestamps.Timestamp | None