如何使用PowerShell将当前日期计算为1601-01-01之后的毫秒数

如何使用windows PowerShell脚本计算自1601-01-01以来当前日期的毫秒数？

---

我需要它来构建正确的LDAP查询。

一个

DateTime

结构包含方法

ToFileTime

。根据,

Windows文件时间是一个64位的值，表示 从午夜12:00开始的100纳秒间隔， 公元1601年1月1日，协调世界时（UTC）

因此，从ns（10e-9）到ms（10e-3）是简单的算法。请注意，计数器计数100 ns块，而不是1 ns块。该值存储为Int64，因此不需要进行类型转换。这样,

PS C:\> (Get-Date).ToFileTime()
130142949169114886
PS C:\> (Get-Date).ToFileTime().GetType()

IsPublic IsSerial Name                                     BaseType
-------- -------- ----                                     --------
True     True     Int64                                    System.ValueType

---

完全同意@vonPryz的回答。为了好玩，您可以在Powershell

System.DateTime

的

tick

属性中找到100纳秒的数值。但是这个勾号不是来自“01/01/1600”，而是来自（[datetime]：：MinValue）“01/01/0001”

尝试：

这将是正确的：

(Get-Date).ToFileTime()/10000

如果上面的简单解决方案（Get Date）.ToFileTime（）给出了10000次的错误，我们甚至会想到会发生什么

4205233年。太可怕了

$a = ([datetime]::Now).Ticks
$secTimer=1
Start-Sleep -Seconds $secTimer
$b = ([datetime]::Now).Ticks
$c=$b-$a
'ticks={0} == {1} sec and {2} ticks' -f $c,[int](Get-Date  $c -Format "ss"),[int](Get-Date  $c -Format "fffffff")
$TicksPerSec = $c/$secTimer
'ticks per second = {0}' -f ($c/$secTimer)
echo "`n"
$Year=1601;$Month=1;$date=1;$hour=0;$minutes=0;$Seconds=0;$mSeconds=0;
$Ticks1601 = New-Object DateTime $Year, $Month, $date, $hour, $minutes, $Seconds, $mSeconds
'Ticks on Jan 1 1601 00:00:00   =  {0}' -f $Ticks1601.Ticks
$TicksNow = ([datetime]::Now).Ticks
$time=$TicksNow-$Ticks1601
'after Jan 1 1601 00:00:00'
'  milliseconds {0}' -f ($time.Ticks/$TicksPerSec*1000)
$seconds=$time.Ticks/$TicksPerSec
'  seconds =    {0}' -f $seconds
$min=$seconds/60
'  minutes =    {0}' -f $min
$hours=$min/60
'  hours =      {0}' -f $hours
$days=$hours/24
'  days =        {0}' -f $days
$years=$days/364.75
'  years =      {0}' -f $years

echo "`nand`n"
$ms=(Get-Date).ToFileTime()
'simple ToFileTime() after Jan 1 1601 00:00:00'
'  milliseconds {0}' -f $ms
$years=$ms/1000/60/60/24/364.75
'  years =      {0}' -f $years
'???'
echo "`n"
$Year=1;$Month=1;$date=1;$hour=0;$minutes=0;$Seconds=0;$mSeconds=0;
$time = New-Object DateTime $Year, $Month, $date, $hour, $minutes, $Seconds, $mSeconds
'Ticks on Jan 1 0001 00:00:00   =  {0}' -f $time.Ticks

---

每秒1000万个滴答声。1601年1月1日的PS滴答声00:00:00=50491123200000000年1月1日的PS滴答声0001 00:00:00=0

$a = ([datetime]::Now).Ticks
$secTimer=1
Start-Sleep -Seconds $secTimer
$b = ([datetime]::Now).Ticks
$c=$b-$a
'ticks={0} == {1} sec and {2} ticks' -f $c,[int](Get-Date  $c -Format "ss"),[int](Get-Date  $c -Format "fffffff")
$TicksPerSec = $c/$secTimer
'ticks per second = {0}' -f ($c/$secTimer)
echo "`n"
$Year=1601;$Month=1;$date=1;$hour=0;$minutes=0;$Seconds=0;$mSeconds=0;
$Ticks1601 = New-Object DateTime $Year, $Month, $date, $hour, $minutes, $Seconds, $mSeconds
'Ticks on Jan 1 1601 00:00:00   =  {0}' -f $Ticks1601.Ticks
$TicksNow = ([datetime]::Now).Ticks
$time=$TicksNow-$Ticks1601
'after Jan 1 1601 00:00:00'
'  milliseconds {0}' -f ($time.Ticks/$TicksPerSec*1000)
$seconds=$time.Ticks/$TicksPerSec
'  seconds =    {0}' -f $seconds
$min=$seconds/60
'  minutes =    {0}' -f $min
$hours=$min/60
'  hours =      {0}' -f $hours
$days=$hours/24
'  days =        {0}' -f $days
$years=$days/364.75
'  years =      {0}' -f $years

echo "`nand`n"
$ms=(Get-Date).ToFileTime()
'simple ToFileTime() after Jan 1 1601 00:00:00'
'  milliseconds {0}' -f $ms
$years=$ms/1000/60/60/24/364.75
'  years =      {0}' -f $years
'???'
echo "`n"
$Year=1;$Month=1;$date=1;$hour=0;$minutes=0;$Seconds=0;$mSeconds=0;
$time = New-Object DateTime $Year, $Month, $date, $hour, $minutes, $Seconds, $mSeconds
'Ticks on Jan 1 0001 00:00:00   =  {0}' -f $time.Ticks