Download and unzip the files a folder in your PATH.

When you type HLDate /?, you receive:

HLDate, Version 1.0.1, Copyright (c) 2006, Hard & Landsman *** FREEWARE ***                              This is date/time helper utility for batch works under Windows NT/2000/XP/..                              HLDate \[formatstring\] \[/U\] \[/FD:value\] \[/FW:value\]                                     \[/D:value|/J:value\] \[/L:value\] \[/R\] \[/HIJRI\]                              formatstring    - Just the VBA syntax. Examples: "d, dddd - hh:nn", "0.0000"                              /U(tc)          - Returns UTC instead of local time (ignored with /D or /J)                              /FD:value       - First-day-of-week mode (0 - system default, 1 - 7)                              /FW:value       - First-week-of-year mode (0 - system default, 1 - 3)                              /D(ate):value   - The custom date to be formatted instead of current date                                                Example: /D:"2005-04-03 02:01"                              /J(ulian):value - The custom date as a "Julian day". Example: /J:38445.08403                              /L(cid):value   - Formats and recognizes date according to LocaleID specified                                                Example: /L:0x419. User's settings (0x400) are default                              /R              - Tries to recognize input in alternate locale (for /D or /J)                              /HIJRI          - Alternates calendar