How do you use the now function

[kestral]

I have seen a few examples and read the documentation but have been unable to get the now function to return a value. I'm using ver 3.0.0 of Zabbix and have tried the following

now
now()
now(0)
last(vfs.file.time[{$RHH.CTREE_BACKUP_FOLDER}\BACKUP.DAT]).now
last(vfs.file.time[{$RHH.CTREE_BACKUP_FOLDER}\BACKUP.DAT]).now()
last(vfs.file.time[{$RHH.CTREE_BACKUP_FOLDER}\BACKUP.DAT]).now(0)

each attempt results in an error similar to the following

Cannot evaluate function "now()": item "RHH.ctree:ctree.sct_trfls" not supported.

Is anyone able to provide an example of how I should be determining the number of seconds since a file was last updated.

Thanks,
Andrew

[Zabbixtrainee]

Use fuzzytime.

Check from manual "supported trigger functions"

https://www.zabbix.com/documentation/3.0/manual/appendix/triggers/functions

example.
{host:vfs.file.time[path\to\file,modify].fuzzytime(1h)}=0 ,alerts when a file has been modified over an hour ago

[kestral]

Thanks for the info ZabbixTrainee, but I was more after the time so I could figure out (and plot) how old a file was.

As it turned out I was able to get the value from now using the following

now("vfs.file.time[{$site.CTREE_BACKUP_FOLDER}\BACKUP.DAT]")

It seems to need a valid key inside the brackets. This worked and returns the unixtime (seconds from epoch) so I was able to use that. It would have been simpler if the new function took no parameters.