Understand relative time

Relative time expressions are some number of a number of days (d), hours (h), minutes (m), or seconds (s), specified with either a leading plus sign (+) or a leading minus sign (-). The Relative time field in the PI Point Data Reference window shifts the time context by the specified offset. For example, if a client requests an attribute value at the current time where the relative time expression is -8h, PI AF returns data from eight hours before the current time.

Fractional times are supported. For example, use -1.5d to indicate one and one-half days.

Relative time expressions can contain only one operator, either + or -. For example, the following is not supported:

-1d+1h

The following are all valid relative times:

+1d
-24h
-3.25m
+24s