How to make eval now() takes latest time filter?

[jamin358]

I have a search that makes a decision based on time since an event. 

| eval diff = now() - _time

and then make some decision based on how long ago the event took place

| eval state = if(diff<300, "active", "not active")

However, if I want to run this historically, my diffs are set to current time so I can't easily look historically at a point in time and tell the state of the world (with the same search). 

Is there a time function in search where I can pull the earliest and latest time filters?

eg

| eval diff = $timerange.latest$ - _time 

[ITWhisperer · Accepted solution]

| addinfo
| eval diff = info_max_time - _time