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Editor to share with you how to calculate the number of days of batch processing, I believe that most people do not know much about it, so share this article for your reference, I hope you can learn a lot after reading this article, let's learn about it!

Code 1.

:: DateDel2.bat-deletes files previously modified by the specified number of days under the specified path

Note: variable tian is the specified number of days, 1 yesterday, 2 the day before yesterday, and so on

:: core algorithm: Ritchie Lawrence, updated 2002-08-13. Version 1.1

::

@ echo off & setlocal ENABLEEXTENSIONS

Call: Date2Day% date:~0,10% sdays

% tian% of the rem downstream represents the number of days.

Set / p tian= Please specify the number of days to retrace:

Set / a sdays-=tian

Call: Day2Date% sdays% difdate

Echo.&echo.

The date specified by echo is:% date:~0,10%

Echo.

Echo% tian% days ago the date is:% difdate%

Echo.&pause

Exit

: Date2Day

Setlocal ENABLEEXTENSIONS

For / f "tokens=1-3 delims=/-," an in ('echo/%1') do (

Set yy=%%a & set mm=%%b & set dd=%%c

)

Set / a dd=100%dd%%0,mm=100%mm%%0

Set / a zaqiang 14qmm penny pencils 12department yay yyies 4800liz repertoire mlbs 12m squares 3jacks 153mm penny 2

Set / a j=j/5+dd+y*365+y/4-y/100+y/400-2472633

Endlocal&set% 2=%j%&goto: EOF

: Day2Date

Setlocal ENABLEEXTENSIONS

Set / axioms% 1 Personality 2472632, reparations bimonthly, 4memaurs, 3reparations, baccades, 146097, 146097, racquets, 146097, 146097, 146097, 146097, flashes.

Set / a dancers 4mlbs 3 minutes dpact 1461 gimmick 1461 fuzz 1461 squares dwelling e-makings 4 legends e-mails c memorials 5 praises 2 grinds 2 mores, 153 dads, 153 packs, 2 pads, 5

Set / a dd=-dd+e+1,mm=-m/10,mm*=12,mm+=m+3,yy=b*100+d-4800+m/10

(if% mm% LSS 10 set mm=0%mm%) & (if% dd% LSS 10 set dd=0%dd%)

Endlocal&set% 2=%yy%-%mm%-%dd%&goto: EOF

Code 2.

@ echo off

: ask for the date of N days ago

:: train of thought

:: simulate manual operation, subtract the number of days with the number of days, and borrow 1 from the high position when the difference is negative.

Features:

The code is concise and easy to understand, and the speed depends on the number of days specified

Dates can be marked with weeks, but they must be arranged in the order of years, months and days

:: the year must be four digits, otherwise there will be an error

@ echo off

: Main

Cls

Set day=%date%

Set days=0

Echo.&echo.

The date specified by echo is:% day%

Echo.

Set / p input= Please specify the number of days to retrace:

Setlocal enabledelayedexpansion

:: extraction date

For / f "tokens=1-3 delims=-/." I in ("% day%") do (

Set / a sy=%%i, sm=100%%j 100, sd=100%%k 100

)

Set / a sd-=input

If% sd% leq 0 call: count

Cls

Echo.&echo.

The date specified by echo is:% day%

Echo.

Set sm=0%sm%

Set sd=0%sd%

Echo% input% days ago the date is:% sy%-%sm:~-2%-%sd:~-2%

Pause > nul

Goto Main

: count

Set / a sm-=1

If! sm! Equ 0 set / a sm=12, sy-=1

Call: days

Set / a sd+=days

If sd% leq 0 goto count

Goto: eof

: days

:: gets the total number of days in a specified month

Set / a leap= "^! (sy% 4) & ^! (^! (sy% 100)) | ^! (sy% 400)"

Set / a max=28+leap

Set num=0

Set str=31% max% 31 30 31 30 31 31 30 31 30 31

For I in (str%) do (

Set / a num+=1

If sm% equ! num! Set days=%%i&goto: eof

)

Goto: eof

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