{"id":1900,"date":"2011-12-16T12:49:06","date_gmt":"2011-12-16T17:49:06","guid":{"rendered":"http:\/\/jdhitsolutions.com\/blog\/?p=1900"},"modified":"2011-12-16T12:49:06","modified_gmt":"2011-12-16T17:49:06","slug":"friday-fun-is-it-today","status":"publish","type":"post","link":"https:\/\/jdhitsolutions.com\/blog\/powershell\/1900\/friday-fun-is-it-today\/","title":{"rendered":"Friday Fun Is It Today?"},"content":{"rendered":"<p>I was testing out the PowerShell cmdlets that ship with Backup and Replication from <a href=\"http:\/\/www.veeam.com\/\" title=\"Veeam.com\" target=\"_blank\">Veeam Software<\/a>. I was using the cmdlet to return backup jobs and realized I needed a way to only get those objects where the date was today. Because the property was a complete date time object, I couldn't simply check if A -eq B. I needed something else.<!--more--><\/p>\n<p>I initially thought I could simply check the DayOftheYear property.<\/p>\n<p><code><br \/>\nPS C:\\> $d=Get-Date<br \/>\nPS C:\\> $d.DayOfYear<br \/>\n350<br \/>\nPS C:\\> $d.DayOfYear -eq $now.DayOfYear<br \/>\nTrue<br \/>\n<\/code><\/p>\n<p>But, if the two dates were exactly one year apart, I would get a false positive. Then I thought I would be clever and add the day of year to the year. Kinda like creating a hash. <\/p>\n<p><code><br \/>\nPS C:\\> $yesterday.DayOfYear+$yesterday.year -eq $now.DayOfYear+$now.year<br \/>\nFalse<br \/>\n<\/code><\/p>\n<p>However, as someone pointed out to me this logic is flawed.<\/p>\n<p><code><br \/>\nPS C:\\> [datetime]$a=\"1\/1\/2011\"<br \/>\nPS C:\\> [datetime]$b=\"1\/2\/2010\"<br \/>\nPS C:\\> $a.DayOfYear+$a.year -eq $b.DayOfYear+$b.year<br \/>\nTrue<br \/>\n<\/code><\/p>\n<p>Oops. There probably is a hash I could create but perhaps the better answer is to simply compare the two DateTime objects. For that we can use the Compare-Object cmdlet, which has an alias of diff.<\/p>\n<p><code><br \/>\nPS C:\\> diff $d $now<\/p>\n<p>InputObject                             SideIndicator<br \/>\n-----------                             -------------<br \/>\n12\/16\/2011 12:32:14 PM                  =><br \/>\n12\/16\/2011 12:26:51 PM                  <=\n<\/code><\/p>\n<p>As you can see $d and $now are both the same day. But Compare-Object is finding differences. What I can so is instruct the cmdlet to limit its comparison to specific properties.<\/p>\n<p><code><br \/>\nPS C:\\> diff $d $now -Property DayOfYear,Year<br \/>\n<\/code><\/p>\n<p>Nothing is returned so I can assume the two are identical. Let's check two that are different.<\/p>\n<p><code><br \/>\nPS C:\\> diff $a $b -Property DayOfYear,Year<\/p>\n<p>                 DayOfYear                       Year SideIndicator<br \/>\n                 ---------                       ---- -------------<br \/>\n                         2                       2010 =><br \/>\n                         1                       2011 <=\n\n\nPS C:\\> diff $yesterday $now -Property DayOfYear,Year<\/p>\n<p>                 DayOfYear                       Year SideIndicator<br \/>\n                 ---------                       ---- -------------<br \/>\n                       350                       2011 =><br \/>\n                       349                       2011 <=\n<\/code><\/p>\n<p>Differences are found so these objects are different. I can take this and turn it into a logic construct.<\/p>\n<p><code><br \/>\nPS C:\\> if (diff $yesterday $now -Property DayOfYear,Year) {$False} else {$True}<br \/>\nFalse<br \/>\nPS C:\\> if (diff $d $now -Property DayOfYear,Year) {$False} else {$True}<br \/>\nTrue<br \/>\n<\/code><\/p>\n<p>This seems to get the job done. But since that is a lot to type, and I might want to use this logic again, I'll turn it into a function.<\/p>\n<p><code><br \/>\nFunction Test-IsToday {<\/p>\n<p>Param(<br \/>\n[Parameter(Position=0,Mandatory=$True,HelpMessage=\"Enter a date time value to compare\")]<br \/>\n[ValidateNotNullorEmpty()]<br \/>\n[datetime]$Date<br \/>\n)<\/p>\n<p>$now=Get-Date<br \/>\nWrite-Verbose (\"Comparing {0} to right now {1}\" -f $Date,$Now)<\/p>\n<p>if (Compare-Object -ReferenceObject $Date -DifferenceObject $Now -property dayofyear,year) {<br \/>\n  $False<br \/>\n }<br \/>\nelse {<br \/>\n $True<br \/>\n }<\/p>\n<p>} #End function<br \/>\n<\/code><\/p>\n<p>The function simply wraps up the Compare-Object command and makes it easier for me to pass dates.<\/p>\n<p><code><br \/>\nPS C:\\> test-istoday $now<br \/>\nTrue<br \/>\nPS C:\\> test-istoday $d -verbose<br \/>\nVERBOSE: Comparing 12\/16\/2011 12:26:51 PM to right now 12\/16\/2011 12:43:25 PM<br \/>\nTrue<br \/>\nPS C:\\> test-istoday $yesterday<br \/>\nFalse<br \/>\nPS C:\\> test-istoday \"12\/25\/2011\"<br \/>\nFalse<br \/>\nPS C:\\><br \/>\n<\/code><\/p>\n<p>So far I haven't found a case where this won't work correctly. But if there is, most likely all I'll need to do is add another property comparison with Compare-Object.<\/p>\n<p>Download <a href='http:\/\/jdhitsolutions.com\/blog\/wp-content\/uploads\/2011\/12\/Test-IsToday.txt' target='_blank'>Test-IsToday<\/a> and try it out for yourself.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>I was testing out the PowerShell cmdlets that ship with Backup and Replication from Veeam Software. I was using the cmdlet to return backup jobs and realized I needed a way to only get those objects where the date was today. Because the property was a complete date time object, I couldn&#8217;t simply check if&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[271,4],"tags":[344,343,534],"class_list":["post-1900","post","type-post","status-publish","format-standard","hentry","category-friday-fun","category-powershell","tag-compare-object","tag-functons","tag-powershell"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Friday Fun Is It Today? &#8226; The Lonely Administrator<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/jdhitsolutions.com\/blog\/powershell\/1900\/friday-fun-is-it-today\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Friday Fun Is It Today? &#8226; The Lonely Administrator\" \/>\n<meta property=\"og:description\" content=\"I was testing out the PowerShell cmdlets that ship with Backup and Replication from Veeam Software. 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The posted tip used an example where you\u2026","rel":"","context":"In &quot;Best Practices&quot;","block_context":{"text":"Best Practices","link":"https:\/\/jdhitsolutions.com\/blog\/category\/best-practices\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":2781,"url":"https:\/\/jdhitsolutions.com\/blog\/scripting\/2781\/find-files-with-powershell-3-0\/","url_meta":{"origin":1900,"position":5},"title":"Find Files with PowerShell 3.0","author":"Jeffery Hicks","date":"February 7, 2013","format":false,"excerpt":"My last few articles have looked at using WMI and CIM_DATAFILE class to find files, primarily using Get-WmiObject in PowerShell. But now that we have PowerShell 3.0 at our disposal, we can use the new CIM cmdlets. 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