Get the number of Days in the current month using powershell - powershell

Question

I have the need to retrieve the number of days in the current month, and despite my research, I have yet to find anything in powershell that does it. The following is what I have currently built to get the result I want. is there a better way to do it?
Please note that I am limited to Powershell
#check to see if this is a leap year
function LYC
{
if ([System.DateTime]::isleapyear((Get-Date).Year))
{
$Global:LY = True
}
}
#Get the number of days in current month
function fNOD
{
$MNum = (Get-Date).Month
switch ($MNum)
{
1 {$Global:DaysInMonth=31}
2 {
LYC
if (LY)
{
$Global:DaysInMonth=29
} else {
$Global:DaysInMonth=28
}
}
3 {$Global:DaysInMonth=31}
4 {$Global:DaysInMonth=30}
5 {$Global:DaysInMonth=31}
6 {$Global:DaysInMonth=30}
7 {$Global:DaysInMonth=31}
8 {$Global:DaysInMonth=31}
9 {$Global:DaysInMonth=30}
10 {$Global:DaysInMonth=31}
11 {$Global:DaysInMonth=30}
12 {$Global:DaysInMonth=31}
}
}

Answer 1

http://msdn.microsoft.com/en-us/library/system.datetime.daysinmonth.aspx
# static int DaysInMonth(int year, int month)
[DateTime]::DaysInMonth(2013, 3)

Answer 2

Assuming you want it for any date stored in $date:
((get-date $date -Day 1 -hour 0 -Minute 0 -Second 0).AddMonths(1).AddSeconds(-1)).Day

Answer 3

This seems to me like it might be deceptively easy:
$numDays = ((Get-Date -Month 3) - (Get-Date -Month 2))
28 days in February, July minus June gives me 30 days.
As mentioned below, that apparently sometimes does some weird integer rounding that gives off 29d, 23h, 59m or something else not right.
This seems to be consistent:
$monthLess = Get-Date -Month 4
$NumDays = (Get-Date -Month 5).Subtract($monthLess)