{"id":9711,"date":"2006-09-06T11:21:00","date_gmt":"2006-09-06T11:21:00","guid":{"rendered":"https:\/\/blogs.msdn.microsoft.com\/powershell\/2006\/09\/06\/datetime-utility-functions\/"},"modified":"2019-02-18T13:21:22","modified_gmt":"2019-02-18T20:21:22","slug":"datetime-utility-functions","status":"publish","type":"post","link":"https:\/\/devblogs.microsoft.com\/powershell\/datetime-utility-functions\/","title":{"rendered":"DateTime Utility Functions"},"content":{"rendered":"

I often want to find things that happened Today.  For instance, which files got changed today.  Windows PowerShell makes this easy to do but it can be a bit verbose and I do it a lot so I’ve added a function to my profile:  IsToday.<\/p>\n

function isToday ([datetime]$date)
{[datetime]::Now.Date  -eq  $date.Date}<\/font><\/p>\n

This takes advantage of 2 things:<\/p>\n

    \n
  1. .NET provides a NOW static property which provides the current datetime\n
  2. DateTimes have a DATE property which gives you just the date stripping off the specific time within that date (it always returns 12:00am).<\/li>\n<\/ol>\n

    With this you can do things like:<\/p>\n

    PS> dir > t4.txt
    <\/font><\/strong>PS> dir |where {isToday $_.lastwritetime}<\/font><\/strong><\/font>
        Directory: Microsoft.PowerShell.Core\\FileSystem::C:\\ps<\/font><\/p>\n

    Mode                LastWriteTime     Length Name
    —-                ————-     —— —-
    -a—          9\/6\/2006   8:20 AM      47086 t4.txt
    <\/font><\/p>\n

     <\/p>\n

    That is great but sometimes you want to know Recent things not just the things that happened today.  For that I put together another function to deal with that:<\/p>\n

    function isWithin([int]$days, [datetime]$Date)
    {
        [DateTime]::Now.AddDays($days).Date -le $Date.Date
    }<\/font><\/p>\n

    Note that this doesn’t deal with the case of providing dates in the future – that isn’t something I do much but if you do, this function won’t help you.<\/p>\n

    This is how I get all the application events that occured within the last 2 days<\/p>\n

    PS> get-eventlog application -newest 2048 |where {isWithin -2 $_.TimeWritten}<\/font><\/strong><\/font><\/p>\n

    Index Time          Type Source                EventID Message
    —– —-          —- ——                ——- ——-
    15491 Sep 06 08:14  Erro Userenv                  1054 Windows cannot obtain the domain controller name for your com…
    15490 Sep 06 08:14  Erro Userenv                  1054 Windows cannot obtain the domain controller name for your com…
    15489 Sep 06 08:14  Erro Userenv                  1054 Windows cannot obtain the domain controller name for your com…<\/font><\/p>\n

    ….<\/p>\n

     <\/p>\n

    Enjoy!<\/p>\n

    Jeffrey Snover [MSFT]
    Windows PowerShell\/Aspen Architect
    Visit the Windows PowerShell Team blog at:    http:\/\/blogs.msdn.com\/PowerShell<\/a>
    Visit the Windows PowerShell ScriptCenter at:      http:\/\/www.microsoft.com\/technet\/scriptcenter\/hubs\/msh.mspx<\/a><\/p>\n

     <\/p>\n

    PSMDTAG:DOTNET: Datetime<\/p>\n

    PSMDTAG:FAQ: How can I find all the things that happened today?<\/p>\n

    PSMDTAG:FAQ: How can I find all the things that happened within the last x days?<\/p>\n","protected":false},"excerpt":{"rendered":"

    I often want to find things that happened Today.  For instance, which files got changed today.  Windows PowerShell makes this easy to do but it can be a bit verbose and I do it a lot so I’ve added a function to my profile:  IsToday. function isToday ([datetime]$date) {[datetime]::Now.Date  -eq  $date.Date} This takes advantage of […]<\/p>\n","protected":false},"author":600,"featured_media":13641,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1],"tags":[67,10,68,69],"class_list":["post-9711","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-powershell","tag-datetime","tag-faq","tag-istoday","tag-iswithin"],"acf":[],"blog_post_summary":"

    I often want to find things that happened Today.  For instance, which files got changed today.  Windows PowerShell makes this easy to do but it can be a bit verbose and I do it a lot so I’ve added a function to my profile:  IsToday. function isToday ([datetime]$date) {[datetime]::Now.Date  -eq  $date.Date} This takes advantage of […]<\/p>\n","_links":{"self":[{"href":"https:\/\/devblogs.microsoft.com\/powershell\/wp-json\/wp\/v2\/posts\/9711","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/devblogs.microsoft.com\/powershell\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/devblogs.microsoft.com\/powershell\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/powershell\/wp-json\/wp\/v2\/users\/600"}],"replies":[{"embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/powershell\/wp-json\/wp\/v2\/comments?post=9711"}],"version-history":[{"count":0,"href":"https:\/\/devblogs.microsoft.com\/powershell\/wp-json\/wp\/v2\/posts\/9711\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/powershell\/wp-json\/wp\/v2\/media\/13641"}],"wp:attachment":[{"href":"https:\/\/devblogs.microsoft.com\/powershell\/wp-json\/wp\/v2\/media?parent=9711"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/powershell\/wp-json\/wp\/v2\/categories?post=9711"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/powershell\/wp-json\/wp\/v2\/tags?post=9711"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}