Right, I noticed this after I posted, and hoped I'd have time to test further before you noticed too. $gmt is behaving like it's just another timezone N hours away from the script, which goes on/off daylight time the same calendar time as you do.
A work-around would be calculating the difference between if hours:minutes on the target day compared to that same hours:minutes for today. If that's a multiple of 86400, then both days are either both inside or both outside summertime, and no adjustment is needed. Depending on whether you're peeking into or out of summertime, you might need to adjust +1 or - 1 hours. There might need further calculation to get the right answer for a short period on the day when the clock gets changed by 1 hour, but I'd need to test to confirm.
https://forums.mirc.com/ubbthreads.php/topics/265145/$gmt(number)
Okay, after hours of testing, i did not find any working solution to determine if the target (timestamp as above) time is in daylight period or not... did you find any further?
Thank for your help so far.
