amDifference with amDateFormat is not working

[arindamINT]

I want to display the amDifference in HH:mm:ss format, but its not working. Can anybody help me with the proper syntax?

{{recentItem.booking_time | amDifference: today:'seconds' }} // working perfect

But I want to display the differences in HH:mm:ss format and its not working {{recentItem.booking_time | amDifference: today:'seconds' | amDateFormat: 'HH:mm:ss'}}