当我需要一个日期/时间字符串时，我通常这样做:

set dt=%DATE:~6,4%_%DATE:~3,2%_%DATE:~0,2%__%TIME:~0,2%_%TIME:~3,2%_%TIME:~6,2%
set dt=%dt: =0%

这是为德国日期/时间格式(dd.mm。yyyy hh: mm: ss)。基本上，我将子字符串连接起来，最后将所有空格替换为零。

结果字符串的格式为:yyyy_mm_dd__hh_mm_ss

子字符串如何工作的简短解释:

%VARIABLE:~num_chars_to_skip,num_chars_to_keep%

因此，要想从“29.03.2018”这样的日期中得到年份，可以使用:

%DATE:~6,4%
       ^-----skip 6 characters
         ^---keep 4 characters 

如前所述，只有在您知道当前用户使用的格式(例如，MM/dd/yy或dd-MM-yyyy，仅举两个例子)时，解析日期和时间才有用。这是可以确定的，但是当您完成所有的强调和解析时，您仍然会遇到使用了意想不到的格式的情况，需要进行更多的调整。

您还可以使用一些外部程序，它们将以您喜欢的格式返回日期段，但这样做的缺点是需要将实用程序与脚本/批处理一起分发。

也有批处理技巧使用CMOS时钟在一个相当原始的方式，但这是太接近裸线对大多数人来说，也不总是首选的地方来检索日期/时间。

下面是避免上述问题的解决方案。是的，它引入了一些其他问题，但就我的目的而言，我发现这是在现代Windows系统的.bat文件中创建日期戳的最简单、最清晰、最可移植的解决方案。这只是一个示例，但我认为您将看到如何修改其他日期和/或时间格式等。

reg copy "HKCU\Control Panel\International" "HKCU\Control Panel\International-Temp" /f
reg add "HKCU\Control Panel\International" /v sShortDate /d "yyMMdd" /f
@REM reg query "HKCU\Control Panel\International" /v sShortDate
set LogDate=%date%
reg copy "HKCU\Control Panel\International-Temp" "HKCU\Control Panel\International" /f

这个批处理脚本将完全按照O.P.的要求执行(在Windows XP SP3上测试)。

我还使用了前面“jph”所描述的聪明的注册表技巧，我认为这是在任何新的或旧的Windows系统上获得100%一致的日期格式“yyyy_MM_dd”的最简单方法。对一个注册表值的更改是瞬时、临时和微不足道的;它只持续几毫秒，然后立即恢复。

双击此批处理文件进行即时演示，命令提示符窗口将弹出并显示您的时间戳. . . . .

::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
:: generates a custom formatted timestamp string using date and time.
:: run this batch file for an instant demo.
::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::

@ECHO OFF
SETLOCAL & MODE CON:COLS=80 LINES=15 & COLOR 0A

:: --- CHANGE THE COMPUTER DATE FORMAT TEMPORARILY TO MY PREFERENCE "yyyy_MM_dd",
REG COPY "HKCU\Control Panel\International" "HKCU\Control Panel\International-Temp" /f 2>nul >nul
REG ADD "HKCU\Control Panel\International" /v sShortDate /d "yyyy_MM_dd" /f 2>nul >nul

SET MYDATE=%date%

:: --- REVERT COMPUTER DATE BACK TO SYSTEM PREFERENCE
REG COPY "HKCU\Control Panel\International-Temp" "HKCU\Control Panel\International" /f 2>nul >nul
REG DELETE "HKCU\Control Panel\International-Temp" /f 2>nul >nul

:: --- SPLIT THE TIME [HH:MM:SS.SS] TO THREE SEPARATE VARIABLES [HH] [MM] [SS.SS]
FOR /F "tokens=1-3 delims=:" %%A IN ('echo %time%') DO (
SET HOUR=%%A
SET MINUTES=%%B
SET SECONDS=%%C
)

:: --- CHOOSE ONE OF THESE TWO OPTIONS :
:: --- FOR 4 DIGIT SECONDS        //REMOVES THE DOT FROM THE SECONDS VARIABLE [SS.SS]
:: SET SECONDS=%SECONDS:.=%
:: --- FOR 2 DIGIT SECONDS        //GETS THE FIRST TWO DIGITS FROM THE SECONDS VARIABLE [SS.SS]
SET SECONDS=%SECONDS:~0,2% 

:: --- FROM 12 AM TO 9 AM, THE HOUR VARIABLE WE EXTRACTED FROM %TIME% RETURNS A SINGLE DIGIT, 
:: --- WE PREFIX A ZERO CHARACTER TO THOSE CASES, SO THAT OUR WANTED TIMESTAMP
:: --- ALWAYS GENERATES DOUBLE-DIGIT HOURS (24-HOUR CLOCK TIME SYSTEM).
IF %HOUR%==0 (SET HOUR=00)
IF %HOUR%==1 (SET HOUR=01)
IF %HOUR%==2 (SET HOUR=02)
IF %HOUR%==3 (SET HOUR=03)
IF %HOUR%==4 (SET HOUR=04)
IF %HOUR%==5 (SET HOUR=05)
IF %HOUR%==6 (SET HOUR=06)
IF %HOUR%==7 (SET HOUR=07)
IF %HOUR%==8 (SET HOUR=08)
IF %HOUR%==9 (SET HOUR=09)

:: --- GENERATE OUR WANTED TIMESTAMP
SET TIMESTAMP=%MYDATE%__%HOUR%_%MINUTES%_%SECONDS%

:: --- VIEW THE RESULT IN THE CONSOLE SCREEN
ECHO.
ECHO    Generate a custom formatted timestamp string using date and time.
ECHO.
ECHO    Your timestamp is:    %TIMESTAMP%
ECHO.
ECHO.
ECHO    Job is done. Press any key to exit . . .
PAUSE > NUL

EXIT

REM Assumes UK style date format for date environment variable (DD/MM/YYYY).
REM Assumes times before 10:00:00 (10am) displayed padded with a space instead of a zero.
REM If first character of time is a space (less than 1) then set DATETIME to:
REM YYYY-MM-DD-0h-mm-ss
REM Otherwise, set DATETIME to:
REM YYYY-MM-DD-HH-mm-ss
REM Year, month, day format provides better filename sorting (otherwise, days grouped
REM together when sorted alphabetically).

IF "%time:~0,1%" LSS "1" (
   SET DATETIME=%date:~6,4%-%date:~3,2%-%date:~0,2%-0%time:~1,1%-%time:~3,2%-%time:~6,2%
) ELSE (
   SET DATETIME=%date:~6,4%-%date:~3,2%-%date:~0,2%-%time:~0,2%-%time:~3,2%-%time:~6,2%
)

ECHO %DATETIME%

使用%，当时间值为7-9时，您将遇到十六进制操作错误。为了避免这种情况，请使用delayeexpand并使用!min:~1!

如果你有PowerShell，另一个方法是调用它:

for /F "usebackq delims=Z" %%i IN (`powershell Get-Date -format u`) do (set server-time=%%i)

:: =============================================================
:: Batch file to display Date and Time seprated by undescore.
:: =============================================================
:: Read the system date.
:: =============================================================
@SET MyDate=%DATE%
@SET MyDate=%MyDate:/=:%
@SET MyDate=%MyDate:-=:%
@SET MyDate=%MyDate: =:%
@SET MyDate=%MyDate:\=:%
@SET MyDate=%MyDate::=_%
:: =============================================================
:: Read the system time.
:: =============================================================
@SET MyTime=%TIME%
@SET MyTime=%MyTime: =0%
@SET MyTime=%MyTime:.=:%
@SET MyTime=%MyTime::=_%
:: =============================================================
:: Build the DateTime string.
:: =============================================================
@SET DateTime=%MyDate%_%MyTime%
:: =============================================================
:: Display the Date and Time as it is now.
:: =============================================================
@ECHO MyDate="%MyDate%" MyTime="%MyTime%" DateTime="%DateTime%"
:: =============================================================
:: Wait before close.
:: =============================================================
@PAUSE
:: =============================================================