as I say in issue ZBXNEXT-2045, a macro to display the last time a data is collected for an item would be great.
It's not exactly the same as "the time of history wich generate the event", but it's an item time macro.
- {ITEM.LASTCLOCK}
= time of the last collected data for the item.
- {ITEM.LASTDATE}
= Date of the last collected data for the item.
I vote for this feature 
It exists when items are log type, and you can use {ITEM.LOG.AGE} {ITEM.LOG.DATE} and {ITEM.LOG.TIME}, but not for other types.
I'm using honeycombs to keep track of Mysql NDB backups and current phase (one of many examples):
So in the Primary label I'm using this 2 macros to get the hostname to identify the cluster.
On the Secondary label I have the last number of the backup and the current phase of the data node (using preprocessors to discard if the value didn't change), but I also want to show "when" I got this new value.
And this is could be the perfect usage:
{ITEM.LAST.DATE}
{ITEM.LAST.TIME}Also, this will help to reduce the amount of items per template/host as we don't need to capture "when". And finally think about triggers using these macros.
This seems to have a duplicate: https://support.zabbix.com/browse/ZBXNEXT-7017
I have voted for both
Another use case. I have a trapper item for JSON strings. It could take 100ms or could take 1 hour to receive the next one.
First, I want to see on a dashboard widget how long in secs was the last one. Though I still need to create a calculated item (1 second intervals) to check difference between {ITEM.LAST.TIME} and now(). Maybe can be possible to add another macro (or a macro function) to do this in real time.
Second, I need to use baseline functions for triggers, as the incoming data drops during night and certain hours.
This will be implemented with ZBXNEXT-9603. Please follow updates there.