The timestamp for the files on his website Index of /SamsungTVPlus/ is New Zealand time (UTC +13)
us.m3u8 13-Mar-2024 07:08 106421
us.xml 13-Mar-2024 07:08 1480927
Looks like the us.xml file contains about 12 6 hours of up to date EPG
It was last generated (generated-ts="1710266901") at Epoch time 1710266901 (Tuesday, March 12, 2024 18:08:21 UTC)
<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE tv SYSTEM "xmltv.dtd"><tv generator-info-name="www.matthuisman.nz" generated-ts="1710266901">
That corresponds to this hour for start/stop times in the xml
20240312180000 +0000