Batch Script: Validate Date Input

Question

I have a batch file that I use to create new project folders for clients that walks a user through the creation process and adds the appropriate files and folders to a centr

Answer 1

The Batch file below check that the inserted date have the right format and that it represent a valid date, that is, that have the right number of days in each month, even for February on leap years!

@echo off
setlocal EnableDelayedExpansion

set i=0
for %%a in (31 28 31 30 31 30 31 31 30 31 30 31) do (
   set /A i+=1
   set dpm[!i!]=%%a
)

set /P "inDate=Please insert date (MM-DD-YYYY format): "
if "%inDate:~2,1%%inDate:~5,1%" neq "--" goto invalidDate
for /F "tokens=1-3 delims=-" %%a in ("%inDate%") do set "MM=%%a" & set "DD=%%b" & set "YYYY=%%c"
ver > NUL
set /A month=1%MM%-100, day=1%DD%-100, year=1%YYYY%-10000, leap=year%%4  2>NUL
if errorlevel 1 goto invalidDate
if not defined dpm[%month%] goto invalidDate
if %leap% equ 0 set dpm[2]=29
if %day% gtr !dpm[%month%]! goto invalidDate
if %day% lss 1 goto invalidDate
echo Date correct: %YYYY%-%MM%-%DD%
goto :EOF

:invalidDate
echo Bad date