
Microsoft Sentinel in Action
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Scalar functions take a value and perform some sort of manipulation on it to return a different value. They are useful for performing conversions between data types, looking at only part of the variable, and performing mathematical computations.
The ago()
function is used to subtract a specific timespan from the current UTC time. Remember that all times stored in the Log Analytics log are based on UTC time, unless they are times in a custom log that are specifically designed not to be. Generally, it is safe to assume that the times stored are based on UTC time.
If I wanted to look for events in StormEvents
that ended less than an hour ago, I would use the following command. Note that this command doesn't return any values as the times stored are from 2007:
StormEvents | where EndTime > ago(1h)
In addition to using h
for hours, you can also use d
for days, among others.
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