If I understand your requirement correctly, you want to calculate the number of days from that date to current time.
Here's an example, which you can paste into a search window
| makeresults | eval date="2021-01-29 00:25:58.913024+00" | eval dz=strptime(date, "%F %H:%M:%S.%6N%:::z") | eval days=(now()-dz)/86400
The first two lines are creating your data.
Then it parses that date/time using the strptime variables documented here
and then calculates the number of days. I am assuming the +00 represents the time zone offset in hours.
in my case i have a field name : First Date so in that field i have
so i used
| makeresults | eval date="First Date" | eval dz=strptime(date, "%F %H:%M:%S.%6N%:::z") | eval days=(now()-dz)/86400
i am getting eval command the 'striptime' function is unsopperted or undifined
The use of makeresults is done to show an example of how this works and to set up the example data and is not working with your data. In your use case, you would not use makeresults, you would use your normal search.
You would need this part, note that the First Date field name has to be wrapped in single quotes in an eval statement.
| eval dz=strptime('First Date', "%F %H:%M:%S.%6N%:::z") | eval days=(now()-dz)/86400
Your message said "striptime" - it is strptime