Current_Path 获取脚本所在路径（当前路径），取当前时间做文件名(uformat)

获取脚本当前所在路径：

$CurrentPath = $MyInvocation.MyCommand.Path.substring(0,$MyInvocation.MyCommand.Path.LastIndexOf('\')+1)
$today = Get-Date -UFormat "%Y%m%d"
$LogFilePath = $CurrentPath+"Result_$today.txt"

get-process |out-file $LogFilePath -Append

$Currentpath     = Split-Path -parent $MyInvocation.MyCommand.Definition

格式化日期：

$now = get-date -format 'yyyyMMddHHmm'
$dpunmountcmd_ScriptName = "DPUnmount_script_" + $now + ".txt"

$yes = (get-date).adddays(-1)
get-date -date $yes -uformat "%Y/%M/%d" 输出： 2014/06/23

$yes.tostring("yyyy\/MM\/dd")  输出： 2014/06/23

Get-Date使用Format参数考取年、月、日、时、分、秒

yyyy    年
M    月
d    日
h    小时（12小时制）
H    小时（24小时制）
m    分钟
s    秒

Get-Date -UFormat "%Y/%m/%d"   ：2014/04/18

get-date -uformat %R  ：11:07

==============================

Get-Date -UFormat %<value>

For example,

Get-Date -UFormat %d

Date-Time:

Date and time - full

(default) (Friday, June 16, 2006 10:31:27 AM)

c Date and time - abbreviated (Fri Jun 16 10:31:27 2006)

Date:

D Date in mm/dd/yy format (06/14/06)

x Date in standard format for locale (09/12/07 for English-US)

Year:

C Century (20 for 2006)

Y Year in 4-digit format (2006)

y Year in 2-digit format (06)

G Same as 'Y'

g Same as 'y'

Month:

b Month name - abbreviated (Jan)

B Month name - full (January)

h Same as 'b'

m Month number (06)

Week:

W Week of the year (00-52)

V Week of the year (01-53)

U Same as 'W'

Day:

a Day of the week - abbreviated name (Mon)

A Day of the week - full name (Monday)

u Day of the week - number (Monday = 1)

d Day of the month - 2 digits (05)

e Day of the month - digit preceded by a space ( 5)

j Day of the year - (1-366)

w Same as 'u'

Time:

p AM or PM

r Time in 12-hour format (09:15:36 AM)

R Time in 24-hour format - no seconds (17:45)

T Time in 24 hour format (17:45:52)

X Same as 'T'

Z Time zone offset from Universal Time Coordinate (UTC) (-07)

Hour:

H Hour in 24-hour format (17)

I Hour in 12 hour format (05)

k Same as 'H'

l Same as 'I' (Upper-case I = Lower-case L)

Minutes & Seconds:

M Minutes (35)

S Seconds (05)

s Seconds elapsed since January 1, 1970 00:00:00 (1150451174.95705)

Special Characters:

n newline character (\n)

t Tab character (\t)

详细参考：http://www.cnblogs.com/dreamer-fish/p/3805726.html

From：http://technet.microsoft.com/zh-cn/library/hh849887.aspx