Okay yes I found out that the DateTime Formatter was the best to use but I'm not quite sure what to but in the string. Also thank you for the help!
How are you defining most current readings? The most recent, ones taken today, ones taken in the past 24 hours?
If you want anything with a date that matches today you could test like this

How are you defining most current readings? The most recent, ones taken today, ones taken in the past 24 hours?
If you want anything with a date that matches today you could test like this

Ones taken the past 24 hours but I need the time to stay in UTC (GMT)
Also I have stream gauges and rain sites as 2 feature layers in arcmap/arcpro. FME is being used to generate the tables with the sensor information. I constantly have to Run Translation in FME to update the table in ArcCatalog but is there a way to have FME constantly running so the table is frequently updated with the most current sensor information?
Ones taken the past 24 hours but I need the time to stay in UTC (GMT)
The tester alters the format for the test but does not change the underlying data.
But if you want past 24 hours you want to test for greater than @DateTimeAdd(@DateTimeNow(),-PT24H)