Custom attribute with custom date

did you try the date placeholder instead ? https://wp-events-plugin.com/documentation/placeholders/ (please see Date and Times section)

Yes I did, but it was giving me the date for the event and not my custom field.

tried this format #F#j#Y#H at Events > Settings > Formatting > Events and it worked for me.

Yes I know this works for me too, but for the event date, not my custom field which I use the #ATT_{custom_field}

I think the problem could be that the datestamp is being treated as a string, rather than a number. Can you post the code you’re using? Thanks.

“I have a custom field (#ATT_{key}) that outputs a date in this format: 1386374400”

That will defintely be treated as a string. You’ll need to convert it to an integer in order to use it as a timestamp.

Thanks