PSDates provides you all the tools you need when working with dates and times in PowerShell. It contains function to help you find specific date formats, get certain dates based on other dates (first/last day of the month or year, patch Tuesday, etc). I also has functions for working with timezones, unix time, WMI time, crontabs.

A curated collection of over 230 PowerShell functions. Many functions written by me. Others are attributed wherever possible.

Read or update the Exif DateTaken (ExifDT) property in an image file

PowerShell module wrapper for displaying folder/file dialogs in scripts.

HelperFunctions PowerShell API Interface

Gets a series of datetime objects for a specified start, interval, units (for the interval) and limit (for the number of datetime instances you want returned).

PowerShell "sugar", e.g. concisely aliased proxy functions for common command parameterizations. Intended for use in interactive sessions.

A PowerShell module with functions to help calculate working hours, and for generally working with or calculating business hours / date times.