您是如何基于生日确定一个人的年龄？您可以将 Get-Date 命令返回的当前时间减去生日事件，但是结果并不包含年数：
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$birthday = Get-Date -Date '1978-12-09'
$today = Get-Date
$timedifference = $today - $birthday
$timedifference
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以下是结果：
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| Days : 13905
Hours : 16
Minutes : 34
Seconds : 58
Milliseconds : 575
Ticks : 12014516985758198
TotalDays : 13905.6909557387
TotalHours : 333736.582937728
TotalMinutes : 20024194.9762637
TotalSeconds : 1201451698.57582
TotalMilliseconds : 1201451698575.82
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要计算年数，请取 “ticks” 的数值（衡量时间最小单位），并且转换为 datetime 类型，然后取年数并减一：
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$birthdayString = '1978-12-09'
$birthday = Get-Date -Date $birthdayString
$today = Get-Date
$timedifference = $today - $birthday
$ticks = $timedifference.Ticks
$age = (New-Object DateTime -ArgumentList $ticks).Year -1
"Born on $birthdayString = $age Years old (at time of printing)"
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这是计算结果的样子：
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| Born on 1978-12-09 = 38 Years old (at time of printing)
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