Rockwell Automation FactoryTalk Historian SE DataLink 4.2 User Guide - Manual (Page 97)

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PI Time String Meaning
*-1h One hour ago
t+8h 8:00:00 am today
y-8h 4:00:00 pm on the day before yesterday
mon+14.5h 2:30:00 pm last Monday
sat-1m 11:59:00 pm last Friday
Time Interval Examples
In interval expressions, a positive or unmarked interval is based on the start
time, and a negative interval is based on the end time of a time expression.
For example, if the start time is y, the end time is t, and the interval is +5h
for a Sampled Data function, then interpolated values are generated at y,
y+5h, y+10h, y+15h, and y+20h. If the interval is -5h, the interpolated
values are generated at y+4h, y+9h, y+14h, y+19h and t.
PI Time String Meaning
1.5h One and one-half hours
32m Thirty-two minutes
49s Forty-nine seconds
+5h Five hours added to the time beginning with
the start time.
-5h Five hours subtracted from the time
beginning with the end time.
FactoryTalk Historian Data Type Support
FactoryTalk Historian DataLink supports the following FactoryTalk
Historian point data types: