isDST,  Version 1.03
Check if a date is in Daylight Saving Time

Usage:  ISDST  [ date ]  [ /Verbose ]

Where:  date       is an optional date/time to check (default: today/now)
        /Verbose   tells the program to display the result on screen

Notes:  An "errorlevel" 0 is returned if the date is in DST, 2 if the date
        is not in DST, or 1 in case of (command line) errors.
        This program uses local date/time formats and timezone settings.
        /Verbose switch may be abbreviated to /V.

Written by Rob van der Woude
https://www.robvanderwoude.com