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Super! Usage ping here - for me this is a wonderful instructive example, many thanks, Antonio!

P.S. But mystery: after all why the author of FC did not provide the obvious key for immediate exit after the first mismatch ??

Antonio, very good idea,
but your variant above is not working as it should
(at least - in my case only, Windows 7):
again - not after first mismatch, but after full scan...

(attachment: files for test)

> One way would be to redirect output to NUL

This way does not win time: ERRORLEVEL returns 1 not after first mismatch, but only after the end of scan...

Hi ! FC.EXE can compare very large files (more than 4 gb), but here is the question about excessive delay in identifying files inequality: does FC.EXE has (an undocumented) key to complete the work immediately after finding the first mismatch ? Or is it possible to get the same result in some other ...

You're right - I missed, thanks you.

So now I have needful string:

for /f %%a in ('jTimestamp -D "ISO %date_time%"') do set your_date=%%a

Great work, Dave!

Thank you very much, Dave!

Could you also show how to right use jTimestamp to the input value from the initial post of this topic - "2016-11-14T16:09:58.886317071Z" ?

it would be great!

@Compo

tried: getTimestamp-v2.6 or jTimestamp - can't...

Dear dbenham , as it turned out, getTimestamp.bat - can handle the format 2016-11-14T08:09:58.886317071-08:00 , but can't handle the format 2016-11-14T16:09:58.886317071Z : after for /f %%a in ('getTimestamp -D "^'%server_date%^'"') do set your_date=%%a we get message "Invalid -D valu...

> I suppose you wrote a program similiar to this

Much easier: I already had handy self-made program on menu - combination of monitor and "encyclopedia"
If it is interesting - here it is: http://files.rsdn.org/42164/menuspy.zip (screenshot: http://files.rsdn.org/42164/menuspy.png).

Hi, Aacini! You wrote: "SC_SCROLL=0xFFF3=65523 is an undocumented value that was researched by S.O. user MC ND." But it would be strange to document this value - it is just menuitem's ID from standard system menu of CMD window: Restore F120 Move F010 Size F000 Minimize F020 Maximize F030 C...

@Compo - clear, thanks.

Hi Compo,

you wrote
"str2=%str1:*er=%"
instead of
"str2=%str1:er=&rem.%"
and got
"str2=ty67890"
instead of
"str2=12345qw"...

I don't understand - what for?

for clarity:

set str1=12345qwerty67890
set str2=%str1:er=&rem.%
set str3=%str1:er=&:%

these concrete str2 and str3 are the same, my question was: but is this always so?

Thanks to aGerman for counterexample.