I thought it might be fun today to use PowerShell to discover all the Friday the 13ths in a given year. So I put together a simple PowerShell one-liner. To make it flexible I'll use a variable for the year, using the current year as my value.<\/p>\n
$year = (Get-date).Year<\/pre>\nBecause there can only be one Friday the 13th per month, I can use code like this to build a datetime object for the 13th of every month.<\/p>\n
\r\n1..12 | where { ([datetime]\"$_\/13\/$year\").DayOfWeek -eq 'Friday'}\r\n<\/pre>\nBut this will only give me the integers for the matching months. So I'll take this a step further and get the actual datetime object.<\/p>\n
\r\n1..12 | foreach { ([datetime]\"$_\/13\/$year\") } | where { $_.DayOfWeek -eq 'Friday'} \r\n<\/pre>\nIf you try this code you'll see two results for 2013. I can take this idea a step further. Suppose I want to find the last Friday of every month. Here's one way I might do it:<\/p>\n
\r\n$year = (Get-date).Year\r\n\r\n1..12 | foreach { \r\n$month=$_\r\n$moDays = [datetime]::DaysInMonth($year,$_)\r\n1..$moDays | foreach {\r\n ([datetime]\"$month\/$_\/$year\") \r\n }| where { $_.DayOfWeek -eq 'Friday'} |\r\n Select -Last 1\r\n }\r\n<\/pre>\nAll I've done is taken my outer monthly loop, and added an inner ForEach loop to test each day of the month for a Friday and then select the last one for each month. I'll let you try it on your own to see the results.<\/p>\n
As for today, don't worry. It's just another day and a Friday at that!<\/p>\n","protected":false},"excerpt":{"rendered":"
I thought it might be fun today to use PowerShell to discover all the Friday the 13ths in a given year. So I put together a simple PowerShell one-liner. To make it flexible I’ll use a variable for the year, using the current year as my value. $year = (Get-date).Year Because there can only be…<\/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":"New blog post: Friday Fun: Get Friday the 13th #PowerShell","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[271,4],"tags":[70,568,534],"class_list":["post-3374","post","type-post","status-publish","format-standard","hentry","category-friday-fun","category-powershell","tag-datetime","tag-friday-fun","tag-powershell"],"yoast_head":"\n
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