How to format a DateTime in PowerShell

Question

I can format the Get-Date cmdlet no problem like this    date   Get-Date -format  yyyyMMdd    But once I ve got a date in a variable  how do I format it  The statement below   dateStr    date -format  yyyMMdd    returns this error       You must provide a value expression   on the right-hand side of the  -f    operator

User · Accepted Answer

The same as you would in  NET    DateStr    Date ToString  yyyyMMdd     Or    DateStr     0 yyyyMMdd   -f  Date

User · Answer

A very convenient -- but probably not all too efficient -- solution is to use the member function GetDateTimeFormats      d   Get-Date  d GetDateTimeFormats     This outputs a large string-array of formatting styles for the date-value  You can then pick one of the elements of the array via the   -operator  e g    PS C   gt   d GetDateTimeFormats   12  Dienstag  29  November 2016 19 14

User · Answer

If you got here to use this in cmd exe  in a batch file    powershell -Command  Get-Date  ToString  yyyy-MM-dd

User · Answer

The question is answered  but there is some more information missing   Variable vs  Cmdlet  You have a value in the  Date variable and the -f operator does work in this form   format string  -f values  If you call Get-Date -format  yyyyMMdd  you call a cmdlet with some parameters  The value  yyyyMMdd  is the value for parameter Format  try help Get-Date -param Format    -f operator  There are plenty of format strings  Look at least at part1 and part2  She uses string Format  format string   values    Think of it as  format-string  -f values  because the -f operator works very similarly as string Format method  although there are some differences  for more information look at question at Stack Overflow  How exactly does the RHS of PowerShell s -f operator work

User · Answer

I needed the time and a slight variation on format   This works great for my purposes      get-date  ToLocalTime    ToString  yyyy-MM-dd HHmmss        2019-08-16 215757   According to  mklement0 in comments  this should yield the same result    get-date  ToString  yyyy-MM-dd HHmmss

User · Answer

Very informative answer from  stej  but here is a short answer  Among other options  you have 3 simple options to format  System DateTime  stored in a variable    Pass the variable to the Get-Date cmdlet  Get-Date -Format  HH mm   date Use toString   method   date ToString  HH mm    Use Composite formatting    0 HH mm   -f  date

User · Answer

Do this if you absolutely need to use the -Format option    dateStr   Get-Date  date -Format  yyyMMdd    However   dateStr    date toString  yyyMMdd     is probably more efficient

User · Answer

A simple and nice way is     time    Get-Date  ToString  yyyy MM dd

User · Answer

One thing you could do is    date ToString  yyyyMMdd

User · Answer

For anyone trying to format the current date for use in an HTTP header use the  r  format  short for RFC1123  but beware the caveat     PS C  Users Me gt   get-date  toString  r   Thu  16 May 2019 09 20 13 GMT PS C  Users Me gt  get-date -format r Thu  16 May 2019 09 21 01 GMT PS C  Users Me gt   get-date  ToUniversalTime   toString  r   Thu  16 May 2019 16 21 37 GMT   I e  Don t forget to use  ToUniversalTime

[datetime] How to format a DateTime in PowerShell

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