What you need to do is determine the "start time" and "end time" values to compare them to your field for time. That can be done in various ways depending on how you're calculating.
I've done this in a dashboard comparing against a field called "activity_time" and using the earliest and latest time from the timepicker (token name TimeRange). This is how I did it but there may be a better/easier way.
| eval start_time=relative_time(now(),"$TimeRange.earliest$")
| eval start_time2="$TimeRange.earliest$"
| eval start_time=if(start_time>0,start_time,start_time2)
| eval end_time=relative_time(now(),"$TimeRange.latest$")
| eval end_time2="$TimeRange.latest$"
| eval end_time=if(end_time2="now",9999999999,end_time)
| eval end_time=if(end_time>0,end_time,end_time2)
| where activity_time>=start_time AND activity_time<=end_time
so for 'Yesterday' this turns into:
| eval start_time=relative_time(now(),"-1d@d")
| eval start_time2="-1d@d"
| eval start_time=if(start_time>0,start_time,start_time2)
| eval end_time=relative_time(now(),"@d")
| eval end_time2="@d"
| eval end_time=if(end_time2="now",9999999999,end_time)
| eval end_time=if(end_time>0,end_time,end_time2)
| where activity_time>=start_time AND activity_time<=end_time
Hopefully this helps.
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