How to convert "file.creationtime" to timestamp format?

[#1]

Is there some way to convert "file.creationtime" format to timestamp format?

Like below:

to

[#2]

@Raymond Cui

Try with adding new attribute in UpdateAttribute processor as

---

epochtime

${file.creationTime:toDate("yyyy-MM-dd'T'HH:mm:ss+0000"):toNumber()}

---

Then nifi will match the format and convert to epoch time.