Rockwell Automation FactoryTalk Historian SE ProcessBook 3.2 User Guide - Manual (Page 357)

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 Use absolute or combined time expressions. Avoid using relative time
expressions. Multiple relative time expressions in a time range may
cause an incorrect start time or an error message, depending on the
context of the expression.
 Relative and combined time expressions contain only a single
operator: either a single plus sign (+) or a single minus sign (-).
Additional operators can lead to unpredictable results. For example,
the following are not valid time expressions:
*+1d+4h
T-1d+12h
 The name or short name for an interval used to denote FactoryTalk
Historian time is not case-sensitive.
FactoryTalk Historian Time String Examples
Time Syntax Examples
PI Time String Meaning
06-dec-91 15:00:00 3:00:00 pm on December 6, 1991
* Current time (now)
25 00:00:00 (midnight) on the 25th of the
current month
25-aug-92 00:00:00 (midnight) on August 25th, 1992
8: 08:00:00 on the current date
25 8: 08:00:00 on the 25th of the current month
t 00:00:00 on the current date (today)
y 00:00:00 on the previous date (yesterday)
sun, mon, tue, wed, thu, fri, sat 00:00:00 on the most recent Sunday,
Monday, ... Saturday