filemtime() is AVAILABLE
file_exists() is AVAILABLE
Current GMT time is: Feb 06 2017 01:42:49 should match what is shown at: https://greenwichmeantime.com/ (it does)
Maybe you could run down a list of exactly what numbers should be where in the settings to give me a 24 hour expiry time? Maybe I’ve missed something obvious.
Thank you! I wasn’t familiar with this possibility.
Is there a way to do this using wp-cli? To trigger the effects of the wp-cron? I already have another wp-cli task set up on a cron on the server, and it would be easy to set up another one.