ROBOCOPY acts quirky just after DAYLIGHT SAVINGS TIME

Dan,

Yes, I've often seen that too.
It seems that RoboCopy is not clever enough to realise that the two date-time stamps are referring to the same date-time despite the DST switch and decides, instead, that the previous backup [destination file] is older.
I have not found a solution.


Denis

I use FastCopy (an older version, 3.13). It's a 3rd party app, with a visual version of RoboCopy.

Works really well and exactly like RoboCopy for me.

My DST changes in a couple of weeks.
I'm working through checking that all my RoboCopy scripts do use that /DST switch so I can learn from seeing how they behave afterwards. If I have previously left it off any of them it will stop me reaching any conclusions this 31st March.


Denis

bromberg said:

There's another DST at the end of March?! I thought we all had the same DST on March 10th?
I look forward to your findings.

Dan

It weird, right?
This is the UK's Daylight Saving Time begins on the last Sunday in March:
daylight saving time uk - Search

Wanna hear something else that's a bit weird too? You know how our Mother's Day is in mid-May?
The UK's Mother's Day began in March... not that long ago...
guess on which day...
... mother's day uk - Search
(The US's DST day)

[...my post kinda confused me while writing it.]

bromberg said:

There's another DST at the end of March?! I thought we all had the same DST on March 10th?
I look forward to your findings.

Dan,

As pepanee said, the UK changes to DST ["BST"] from GMT on the last Sunday of March. We then change back on the last Sunday of October.
We lose an hour at the end of March & gain an hour at the end of October.
We say, "Spring forward, Fall back.".
At the time your lot decided to go your own way, both your lot & my lot called the season "Fall". We changed the name to "Autumn" during the mid-1800s when French became fashionable.


I have a couple of dozen scripts using RoboCopy.
In many of those, RoboCopy is used multiple times.
Some of those scripts have existed for thirty years. They've all been built on since then.
I'm going to check that I have included the /DST switch in each occurrence.
I think they all have the switch but I have never sat down and worked my way through them all to check.
I don't want to leave any exceptions because the mixture of behaviours would prevent me understanding RoboCopy behaviour.


Denis

Countries have been experimenting in their own way with DST ever since Old Harry came up with the idea.
Our DST was, at one time, a two hour jump. So even in mid-Summer 8pm would have been dusk.


Denis