PowerShell - 一个与 convertfrom-string 相关的奇怪问题
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【中文标题】PowerShell - 一个与 convertfrom-string 相关的奇怪问题【英文标题】：PowerShell - An weird issue related to convertfrom-string 【发布时间】：2021-03-17 22:21:43 【问题描述】：因此，我尝试使用 PowerShell 作为自我强加的编程挑战来获得 21 世纪四个季节的平均长度。
我的想法是从文本文件中获取值，创建一个 [PSCustomObject] 并为其每行的 noteproperties 分配值，将年份添加到日期并将日期转换为 [datetime] 并添加到另一个数组，然后循环第二个数组使用 index 并使用 new-timespan 获取季节长度并添加到第三个数组和 measure-object 第三个数组，如果这在英语中可能听起来令人困惑，请原谅我，但它在代码中确实非常简单。
现在我从这里得到春分和至日的日期：Solstices and Equinoxes: 2001 to 2100
使用 Notepad++ 格式化我得到的日期：
2001 Mar 20 13:31 Jun 21 07:38 Sep 22 23:05 Dec 21 19:22
2002 Mar 20 19:16 Jun 21 13:25 Sep 23 04:56 Dec 22 01:15
2003 Mar 21 01:00 Jun 21 19:11 Sep 23 10:47 Dec 22 07:04
2004 Mar 20 06:49 Jun 21 00:57 Sep 22 16:30 Dec 21 12:42
2005 Mar 20 12:34 Jun 21 06:46 Sep 22 22:23 Dec 21 18:35
2006 Mar 20 18:25 Jun 21 12:26 Sep 23 04:04 Dec 22 00:22
2007 Mar 21 00:07 Jun 21 18:06 Sep 23 09:51 Dec 22 06:08
2008 Mar 20 05:49 Jun 21 00:00 Sep 22 15:45 Dec 21 12:04
2009 Mar 20 11:44 Jun 21 05:45 Sep 22 21:18 Dec 21 17:47
2010 Mar 20 17:32 Jun 21 11:28 Sep 23 03:09 Dec 21 23:38
2011 Mar 20 23:21 Jun 21 17:16 Sep 23 09:05 Dec 22 05:30
2012 Mar 20 05:15 Jun 20 23:08 Sep 22 14:49 Dec 21 11:12
2013 Mar 20 11:02 Jun 21 05:04 Sep 22 20:44 Dec 21 17:11
2014 Mar 20 16:57 Jun 21 10:52 Sep 23 02:30 Dec 21 23:03
2015 Mar 20 22:45 Jun 21 16:38 Sep 23 08:20 Dec 22 04:48
2016 Mar 20 04:31 Jun 20 22:35 Sep 22 14:21 Dec 21 10:45
2017 Mar 20 10:29 Jun 21 04:25 Sep 22 20:02 Dec 21 16:29
2018 Mar 20 16:15 Jun 21 10:07 Sep 23 01:54 Dec 21 22:22
2019 Mar 20 21:58 Jun 21 15:54 Sep 23 07:50 Dec 22 04:19
2020 Mar 20 03:50 Jun 20 21:43 Sep 22 13:31 Dec 21 10:03
2021 Mar 20 09:37 Jun 21 03:32 Sep 22 19:21 Dec 21 15:59
2022 Mar 20 15:33 Jun 21 09:14 Sep 23 01:04 Dec 21 21:48
2023 Mar 20 21:25 Jun 21 14:58 Sep 23 06:50 Dec 22 03:28
2024 Mar 20 03:07 Jun 20 20:51 Sep 22 12:44 Dec 21 09:20
2025 Mar 20 09:02 Jun 21 02:42 Sep 22 18:20 Dec 21 15:03
2026 Mar 20 14:46 Jun 21 08:25 Sep 23 00:06 Dec 21 20:50
2027 Mar 20 20:25 Jun 21 14:11 Sep 23 06:02 Dec 22 02:43
2028 Mar 20 02:17 Jun 20 20:02 Sep 22 11:45 Dec 21 08:20
2029 Mar 20 08:01 Jun 21 01:48 Sep 22 17:37 Dec 21 14:14
2030 Mar 20 13:51 Jun 21 07:31 Sep 22 23:27 Dec 21 20:09
2031 Mar 20 19:41 Jun 21 13:17 Sep 23 05:15 Dec 22 01:56
2032 Mar 20 01:23 Jun 20 19:09 Sep 22 11:11 Dec 21 07:57
2033 Mar 20 07:23 Jun 21 01:01 Sep 22 16:52 Dec 21 13:45
2034 Mar 20 13:18 Jun 21 06:45 Sep 22 22:41 Dec 21 19:35
2035 Mar 20 19:03 Jun 21 12:33 Sep 23 04:39 Dec 22 01:31
2036 Mar 20 01:02 Jun 20 18:31 Sep 22 10:23 Dec 21 07:12
2037 Mar 20 06:50 Jun 21 00:22 Sep 22 16:13 Dec 21 13:08
2038 Mar 20 12:40 Jun 21 06:09 Sep 22 22:02 Dec 21 19:01
2039 Mar 20 18:32 Jun 21 11:58 Sep 23 03:50 Dec 22 00:41
2040 Mar 20 00:11 Jun 20 17:46 Sep 22 09:44 Dec 21 06:33
2041 Mar 20 06:07 Jun 20 23:37 Sep 22 15:27 Dec 21 12:19
2042 Mar 20 11:53 Jun 21 05:16 Sep 22 21:11 Dec 21 18:04
2043 Mar 20 17:29 Jun 21 10:59 Sep 23 03:07 Dec 22 00:02
2044 Mar 19 23:20 Jun 20 16:50 Sep 22 08:47 Dec 21 05:43
2045 Mar 20 05:08 Jun 20 22:34 Sep 22 14:33 Dec 21 11:36
2046 Mar 20 10:58 Jun 21 04:15 Sep 22 20:22 Dec 21 17:28
2047 Mar 20 16:52 Jun 21 10:02 Sep 23 02:07 Dec 21 23:07
2048 Mar 19 22:34 Jun 20 15:54 Sep 22 08:01 Dec 21 05:02
2049 Mar 20 04:28 Jun 20 21:47 Sep 22 13:42 Dec 21 10:51
2050 Mar 20 10:20 Jun 21 03:33 Sep 22 19:29 Dec 21 16:39
2051 Mar 20 15:58 Jun 21 09:17 Sep 23 01:26 Dec 21 22:33
2052 Mar 19 21:56 Jun 20 15:16 Sep 22 07:16 Dec 21 04:18
2053 Mar 20 03:46 Jun 20 21:03 Sep 22 13:05 Dec 21 10:09
2054 Mar 20 09:35 Jun 21 02:47 Sep 22 19:00 Dec 21 16:10
2055 Mar 20 15:28 Jun 21 08:39 Sep 23 00:48 Dec 21 21:56
2056 Mar 19 21:11 Jun 20 14:29 Sep 22 06:40 Dec 21 03:52
2057 Mar 20 03:08 Jun 20 20:19 Sep 22 12:23 Dec 21 09:42
2058 Mar 20 09:04 Jun 21 02:03 Sep 22 18:07 Dec 21 15:24
2059 Mar 20 14:44 Jun 21 07:47 Sep 23 00:03 Dec 21 21:18
2060 Mar 19 20:37 Jun 20 13:44 Sep 22 05:47 Dec 21 03:00
2061 Mar 20 02:26 Jun 20 19:33 Sep 22 11:31 Dec 21 08:49
2062 Mar 20 08:07 Jun 21 01:10 Sep 22 17:19 Dec 21 14:42
2063 Mar 20 13:59 Jun 21 07:02 Sep 22 23:08 Dec 21 20:22
2064 Mar 19 19:40 Jun 20 12:47 Sep 22 04:58 Dec 21 02:10
2065 Mar 20 01:27 Jun 20 18:31 Sep 22 10:41 Dec 21 07:59
2066 Mar 20 07:19 Jun 21 00:16 Sep 22 16:27 Dec 21 13:45
2067 Mar 20 12:55 Jun 21 05:56 Sep 22 22:20 Dec 21 19:44
2068 Mar 19 18:51 Jun 20 11:55 Sep 22 04:09 Dec 21 01:34
2069 Mar 20 00:44 Jun 20 17:40 Sep 22 09:51 Dec 21 07:21
2070 Mar 20 06:35 Jun 20 23:22 Sep 22 15:45 Dec 21 13:19
2071 Mar 20 12:36 Jun 21 05:21 Sep 22 21:39 Dec 21 19:05
2072 Mar 19 18:19 Jun 20 11:12 Sep 22 03:26 Dec 21 00:54
2073 Mar 20 00:12 Jun 20 17:06 Sep 22 09:14 Dec 21 06:50
2074 Mar 20 06:09 Jun 20 22:59 Sep 22 15:04 Dec 21 12:36
2075 Mar 20 11:48 Jun 21 04:41 Sep 22 21:00 Dec 21 18:28
2076 Mar 19 17:37 Jun 20 10:35 Sep 22 02:48 Dec 21 00:12
2077 Mar 19 23:30 Jun 20 16:23 Sep 22 08:35 Dec 21 06:00
2078 Mar 20 05:11 Jun 20 21:58 Sep 22 14:25 Dec 21 11:59
2079 Mar 20 11:03 Jun 21 03:51 Sep 22 20:15 Dec 21 17:46
2080 Mar 19 16:43 Jun 20 09:33 Sep 22 01:55 Dec 20 23:31
2081 Mar 19 22:34 Jun 20 15:16 Sep 22 07:38 Dec 21 05:22
2082 Mar 20 04:32 Jun 20 21:04 Sep 22 13:24 Dec 21 11:06
2083 Mar 20 10:08 Jun 21 02:41 Sep 22 19:10 Dec 21 16:51
2084 Mar 19 15:58 Jun 20 08:39 Sep 22 00:58 Dec 20 22:40
2085 Mar 19 21:53 Jun 20 14:33 Sep 22 06:43 Dec 21 04:29
2086 Mar 20 03:36 Jun 20 20:11 Sep 22 12:33 Dec 21 10:24
2087 Mar 20 09:27 Jun 21 02:05 Sep 22 18:27 Dec 21 16:07
2088 Mar 19 15:16 Jun 20 07:57 Sep 22 00:18 Dec 20 21:56
2089 Mar 19 21:07 Jun 20 13:43 Sep 22 06:07 Dec 21 03:53
2090 Mar 20 03:03 Jun 20 19:37 Sep 22 12:01 Dec 21 09:45
2091 Mar 20 08:40 Jun 21 01:17 Sep 22 17:49 Dec 21 15:37
2092 Mar 19 14:33 Jun 20 07:14 Sep 21 23:41 Dec 20 21:31
2093 Mar 19 20:35 Jun 20 13:08 Sep 22 05:30 Dec 21 03:21
2094 Mar 20 02:20 Jun 20 18:40 Sep 22 11:15 Dec 21 09:11
2095 Mar 20 08:14 Jun 21 00:38 Sep 22 17:10 Dec 21 15:00
2096 Mar 19 14:03 Jun 20 06:31 Sep 21 22:55 Dec 20 20:46
2097 Mar 19 19:49 Jun 20 12:14 Sep 22 04:37 Dec 21 02:38
2098 Mar 20 01:38 Jun 20 18:01 Sep 22 10:22 Dec 21 08:19
2099 Mar 20 07:17 Jun 20 23:41 Sep 22 16:10 Dec 21 14:04
2100 Mar 20 13:04 Jun 21 05:32 Sep 22 22:00 Dec 21 19:51
然后我在 Windows 10 上的 PowerShell 7.1 x64 上使用了这些代码：
$timetable = Get-Content .\Desktop\Equinox-Solstice.txt | Convertfrom-String -Templatefile .\Desktop\template.txt
$count=$timetable.count
$timetable1=@()
for ($i=0;$i -lt $count;$i++)
$year=[string]$timetable[$i].year
$mequi=[datetime]($year+" "+$timetable[$i].marequi)
$jsols=[datetime]($year+" "+$timetable[$i].junsols)
$sequi=[datetime]($year+" "+$timetable[$i].sepequi)
$dsols=[datetime]($year+" "+$timetable[$i].decsols)
$timetable1+=[pscustomobject]@year=$year;mequi=$mequi;jsols=$jsols;sequi=$sequi;dsols=$dsols
以此为模板：
[int]year*:2001 [string]marequi:Mar 20 13:31 [string]junsols:Jun 21 07:38 [string]sepequi:Sep 22 23:05 [string]decsols:Dec 21 19:22
[int]year*:2002 [string]marequi:Mar 20 19:16 [string]junsols:Jun 21 13:25 [string]sepequi:Sep 23 04:56 [string]decsols:Dec 22 01:15
[int]year*:2003 [string]marequi:Mar 21 01:00 [string]junsols:Jun 21 19:11 [string]sepequi:Sep 23 10:47 [string]decsols:Dec 22 07:04
[int]year*:2004 [string]marequi:Mar 20 06:49 [string]junsols:Jun 21 00:57 [string]sepequi:Sep 22 16:30 [string]decsols:Dec 21 12:42
[int]year*:2005 [string]marequi:Mar 20 12:34 [string]junsols:Jun 21 06:46 [string]sepequi:Sep 22 22:23 [string]decsols:Dec 21 18:35
[int]year*:2006 [string]marequi:Mar 20 18:25 [string]junsols:Jun 21 12:26 [string]sepequi:Sep 23 04:04 [string]decsols:Dec 22 00:22
[int]year*:2007 [string]marequi:Mar 21 00:07 [string]junsols:Jun 21 18:06 [string]sepequi:Sep 23 09:51 [string]decsols:Dec 22 06:08
[int]year*:2008 [string]marequi:Mar 20 05:49 [string]junsols:Jun 21 00:00 [string]sepequi:Sep 22 15:45 [string]decsols:Dec 21 12:04
[int]year*:2009 [string]marequi:Mar 20 11:44 [string]junsols:Jun 21 05:45 [string]sepequi:Sep 22 21:18 [string]decsols:Dec 21 17:47
[int]year*:2010 [string]marequi:Mar 20 17:32 [string]junsols:Jun 21 11:28 [string]sepequi:Sep 23 03:09 [string]decsols:Dec 21 23:38
当我运行命令时，我收到了很多错误消息，它们都是这样的：
InvalidArgument:
Line |
3 | $mequi=[datetime]($year+" "+$timetable[$i].marequi)
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
| Cannot convert value "2093 " to type "System.DateTime". Error: "String '2093 ' was not recognized as a valid DateTime."
我仔细检查了，发现所有这些都来自 $mequi，它代表 March Equinox，我意识到日期肯定丢失了，然后我输入了 $timetable 并确认很多 March Equinox 日期都丢失了，只有 March Equinox缺少日期，然后我使用了这个命令：
for($i=0;$i -lt 99;$i++)if ($timetable[$i].marequi -eq $null)$i
发现其中46个日期缺失，但其他3个类别的日期并没有缺失，只是三月分，缺失日期的索引如下： 11, 15, 19, 23, 27, 31, 35, 39, 40, 43, 44, 47, 48, 51, 52, 55, 56, 59, 60, 63, 64, 67, 68, 69, 71, 72、73、75、76、77、79、80、81、83、84、85、87、88、89、91、92、93、95、96、97、98
有什么想法吗？有人可以帮帮我吗？
Update3：所以我使用了完整的代码：
$timetable = Get-Content .\Desktop\Equinox-Solstice.txt | Convertfrom-String -Templatefile .\Desktop\template.txt
$count=$timetable.count
[array]$timetable1 = 0..99 | foreach-object
$year=[string]$timetable[$_].year
$mequi=[datetime]($year+" "+$timetable[$_].marequi)
$jsols=[datetime]($year+" "+$timetable[$_].junsols)
$sequi=[datetime]($year+" "+$timetable[$_].sepequi)
$dsols=[datetime]($year+" "+$timetable[$_].decsols)
[pscustomobject]@year=$year;mequi=$mequi;jsols=$jsols;sequi=$sequi;dsols=$dsols
[array]$seasons=0..98 | foreach-object
$year=$timetable1[$_].year
$spring=[double](New-Timespan -Start $timetable1[$_].mequi -End $timetable1[$_].jsols).totaldays
$summer=[double](New-Timespan -Start $timetable1[$_].jsols -End $timetable1[$_].sequi).totaldays
$autumn=[double](New-Timespan -Start $timetable1[$_].sequi -End $timetable1[$_].dsols).totaldays
$winter=[double](New-Timespan -Start $timetable1[$_].dsols -End $timetable1[$_+1].mequi).totaldays
[pscustomobject]@year=$year;spring=$spring;summer=$summer;autumn=$autumn;winter=$winter
$meanspring=($seasons.spring | Measure-Object -Average).average
$meansummer=($seasons.summer | Measure-Object -Average).average
$meanautumn=($seasons.autumn | Measure-Object -Average).average
$meanwinter=($seasons.winter | Measure-Object -Average).average
$meanyear=$meanspring+$meansummer+$meanautumn+$meanwinter
Write-Host "Mean Spring Length: $meanspring days, Mean Summer Length: $meansummer days, Mean Autumn Length: $meanautumn days, Mean Winter Length: $meanwinter days, Mean Solar Year Length: $meanyear days"
这就是我得到的：
Mean Spring Length: 92.7203563411897 days, Mean Summer Length: 93.6684764309764 days, Mean Autumn Length: 89.8785914702581 days, Mean Winter Length: 88.9748106060606 days, Mean Solar Year Length: 365.242234848485 days.
更新：我现在正在编辑问题，因为我想分享一个更好的方法。
通过在 Notepad++ 中查找和替换的更多努力，我得到了这个：
"year","marequi","junsols","sepequi","decsols"
"2001","Mar 20 13:31","Jun 21 07:38","Sep 22 23:05","Dec 21 19:22"
"2002","Mar 20 19:16","Jun 21 13:25","Sep 23 04:56","Dec 22 01:15"
"2003","Mar 21 01:00","Jun 21 19:11","Sep 23 10:47","Dec 22 07:04"
"2004","Mar 20 06:49","Jun 21 00:57","Sep 22 16:30","Dec 21 12:42"
"2005","Mar 20 12:34","Jun 21 06:46","Sep 22 22:23","Dec 21 18:35"
"2006","Mar 20 18:25","Jun 21 12:26","Sep 23 04:04","Dec 22 00:22"
"2007","Mar 21 00:07","Jun 21 18:06","Sep 23 09:51","Dec 22 06:08"
"2008","Mar 20 05:49","Jun 21 00:00","Sep 22 15:45","Dec 21 12:04"
"2009","Mar 20 11:44","Jun 21 05:45","Sep 22 21:18","Dec 21 17:47"
"2010","Mar 20 17:32","Jun 21 11:28","Sep 23 03:09","Dec 21 23:38"
"2011","Mar 20 23:21","Jun 21 17:16","Sep 23 09:05","Dec 22 05:30"
"2012","Mar 20 05:15","Jun 20 23:08","Sep 22 14:49","Dec 21 11:12"
"2013","Mar 20 11:02","Jun 21 05:04","Sep 22 20:44","Dec 21 17:11"
"2014","Mar 20 16:57","Jun 21 10:52","Sep 23 02:30","Dec 21 23:03"
"2015","Mar 20 22:45","Jun 21 16:38","Sep 23 08:20","Dec 22 04:48"
"2016","Mar 20 04:31","Jun 20 22:35","Sep 22 14:21","Dec 21 10:45"
"2017","Mar 20 10:29","Jun 21 04:25","Sep 22 20:02","Dec 21 16:29"
"2018","Mar 20 16:15","Jun 21 10:07","Sep 23 01:54","Dec 21 22:22"
"2019","Mar 20 21:58","Jun 21 15:54","Sep 23 07:50","Dec 22 04:19"
"2020","Mar 20 03:50","Jun 20 21:43","Sep 22 13:31","Dec 21 10:03"
"2021","Mar 20 09:37","Jun 21 03:32","Sep 22 19:21","Dec 21 15:59"
"2022","Mar 20 15:33","Jun 21 09:14","Sep 23 01:04","Dec 21 21:48"
"2023","Mar 20 21:25","Jun 21 14:58","Sep 23 06:50","Dec 22 03:28"
"2024","Mar 20 03:07","Jun 20 20:51","Sep 22 12:44","Dec 21 09:20"
"2025","Mar 20 09:02","Jun 21 02:42","Sep 22 18:20","Dec 21 15:03"
"2026","Mar 20 14:46","Jun 21 08:25","Sep 23 00:06","Dec 21 20:50"
"2027","Mar 20 20:25","Jun 21 14:11","Sep 23 06:02","Dec 22 02:43"
"2028","Mar 20 02:17","Jun 20 20:02","Sep 22 11:45","Dec 21 08:20"
"2029","Mar 20 08:01","Jun 21 01:48","Sep 22 17:37","Dec 21 14:14"
"2030","Mar 20 13:51","Jun 21 07:31","Sep 22 23:27","Dec 21 20:09"
"2031","Mar 20 19:41","Jun 21 13:17","Sep 23 05:15","Dec 22 01:56"
"2032","Mar 20 01:23","Jun 20 19:09","Sep 22 11:11","Dec 21 07:57"
"2033","Mar 20 07:23","Jun 21 01:01","Sep 22 16:52","Dec 21 13:45"
"2034","Mar 20 13:18","Jun 21 06:45","Sep 22 22:41","Dec 21 19:35"
"2035","Mar 20 19:03","Jun 21 12:33","Sep 23 04:39","Dec 22 01:31"
"2036","Mar 20 01:02","Jun 20 18:31","Sep 22 10:23","Dec 21 07:12"
"2037","Mar 20 06:50","Jun 21 00:22","Sep 22 16:13","Dec 21 13:08"
"2038","Mar 20 12:40","Jun 21 06:09","Sep 22 22:02","Dec 21 19:01"
"2039","Mar 20 18:32","Jun 21 11:58","Sep 23 03:50","Dec 22 00:41"
"2040","Mar 20 00:11","Jun 20 17:46","Sep 22 09:44","Dec 21 06:33"
"2041","Mar 20 06:07","Jun 20 23:37","Sep 22 15:27","Dec 21 12:19"
"2042","Mar 20 11:53","Jun 21 05:16","Sep 22 21:11","Dec 21 18:04"
"2043","Mar 20 17:29","Jun 21 10:59","Sep 23 03:07","Dec 22 00:02"
"2044","Mar 19 23:20","Jun 20 16:50","Sep 22 08:47","Dec 21 05:43"
"2045","Mar 20 05:08","Jun 20 22:34","Sep 22 14:33","Dec 21 11:36"
"2046","Mar 20 10:58","Jun 21 04:15","Sep 22 20:22","Dec 21 17:28"
"2047","Mar 20 16:52","Jun 21 10:02","Sep 23 02:07","Dec 21 23:07"
"2048","Mar 19 22:34","Jun 20 15:54","Sep 22 08:01","Dec 21 05:02"
"2049","Mar 20 04:28","Jun 20 21:47","Sep 22 13:42","Dec 21 10:51"
"2050","Mar 20 10:20","Jun 21 03:33","Sep 22 19:29","Dec 21 16:39"
"2051","Mar 20 15:58","Jun 21 09:17","Sep 23 01:26","Dec 21 22:33"
"2052","Mar 19 21:56","Jun 20 15:16","Sep 22 07:16","Dec 21 04:18"
"2053","Mar 20 03:46","Jun 20 21:03","Sep 22 13:05","Dec 21 10:09"
"2054","Mar 20 09:35","Jun 21 02:47","Sep 22 19:00","Dec 21 16:10"
"2055","Mar 20 15:28","Jun 21 08:39","Sep 23 00:48","Dec 21 21:56"
"2056","Mar 19 21:11","Jun 20 14:29","Sep 22 06:40","Dec 21 03:52"
"2057","Mar 20 03:08","Jun 20 20:19","Sep 22 12:23","Dec 21 09:42"
"2058","Mar 20 09:04","Jun 21 02:03","Sep 22 18:07","Dec 21 15:24"
"2059","Mar 20 14:44","Jun 21 07:47","Sep 23 00:03","Dec 21 21:18"
"2060","Mar 19 20:37","Jun 20 13:44","Sep 22 05:47","Dec 21 03:00"
"2061","Mar 20 02:26","Jun 20 19:33","Sep 22 11:31","Dec 21 08:49"
"2062","Mar 20 08:07","Jun 21 01:10","Sep 22 17:19","Dec 21 14:42"
"2063","Mar 20 13:59","Jun 21 07:02","Sep 22 23:08","Dec 21 20:22"
"2064","Mar 19 19:40","Jun 20 12:47","Sep 22 04:58","Dec 21 02:10"
"2065","Mar 20 01:27","Jun 20 18:31","Sep 22 10:41","Dec 21 07:59"
"2066","Mar 20 07:19","Jun 21 00:16","Sep 22 16:27","Dec 21 13:45"
"2067","Mar 20 12:55","Jun 21 05:56","Sep 22 22:20","Dec 21 19:44"
"2068","Mar 19 18:51","Jun 20 11:55","Sep 22 04:09","Dec 21 01:34"
"2069","Mar 20 00:44","Jun 20 17:40","Sep 22 09:51","Dec 21 07:21"
"2070","Mar 20 06:35","Jun 20 23:22","Sep 22 15:45","Dec 21 13:19"
"2071","Mar 20 12:36","Jun 21 05:21","Sep 22 21:39","Dec 21 19:05"
"2072","Mar 19 18:19","Jun 20 11:12","Sep 22 03:26","Dec 21 00:54"
"2073","Mar 20 00:12","Jun 20 17:06","Sep 22 09:14","Dec 21 06:50"
"2074","Mar 20 06:09","Jun 20 22:59","Sep 22 15:04","Dec 21 12:36"
"2075","Mar 20 11:48","Jun 21 04:41","Sep 22 21:00","Dec 21 18:28"
"2076","Mar 19 17:37","Jun 20 10:35","Sep 22 02:48","Dec 21 00:12"
"2077","Mar 19 23:30","Jun 20 16:23","Sep 22 08:35","Dec 21 06:00"
"2078","Mar 20 05:11","Jun 20 21:58","Sep 22 14:25","Dec 21 11:59"
"2079","Mar 20 11:03","Jun 21 03:51","Sep 22 20:15","Dec 21 17:46"
"2080","Mar 19 16:43","Jun 20 09:33","Sep 22 01:55","Dec 20 23:31"
"2081","Mar 19 22:34","Jun 20 15:16","Sep 22 07:38","Dec 21 05:22"
"2082","Mar 20 04:32","Jun 20 21:04","Sep 22 13:24","Dec 21 11:06"
"2083","Mar 20 10:08","Jun 21 02:41","Sep 22 19:10","Dec 21 16:51"
"2084","Mar 19 15:58","Jun 20 08:39","Sep 22 00:58","Dec 20 22:40"
"2085","Mar 19 21:53","Jun 20 14:33","Sep 22 06:43","Dec 21 04:29"
"2086","Mar 20 03:36","Jun 20 20:11","Sep 22 12:33","Dec 21 10:24"
"2087","Mar 20 09:27","Jun 21 02:05","Sep 22 18:27","Dec 21 16:07"
"2088","Mar 19 15:16","Jun 20 07:57","Sep 22 00:18","Dec 20 21:56"
"2089","Mar 19 21:07","Jun 20 13:43","Sep 22 06:07","Dec 21 03:53"
"2090","Mar 20 03:03","Jun 20 19:37","Sep 22 12:01","Dec 21 09:45"
"2091","Mar 20 08:40","Jun 21 01:17","Sep 22 17:49","Dec 21 15:37"
"2092","Mar 19 14:33","Jun 20 07:14","Sep 21 23:41","Dec 20 21:31"
"2093","Mar 19 20:35","Jun 20 13:08","Sep 22 05:30","Dec 21 03:21"
"2094","Mar 20 02:20","Jun 20 18:40","Sep 22 11:15","Dec 21 09:11"
"2095","Mar 20 08:14","Jun 21 00:38","Sep 22 17:10","Dec 21 15:00"
"2096","Mar 19 14:03","Jun 20 06:31","Sep 21 22:55","Dec 20 20:46"
"2097","Mar 19 19:49","Jun 20 12:14","Sep 22 04:37","Dec 21 02:38"
"2098","Mar 20 01:38","Jun 20 18:01","Sep 22 10:22","Dec 21 08:19"
"2099","Mar 20 07:17","Jun 20 23:41","Sep 22 16:10","Dec 21 14:04"
"2100","Mar 20 13:04","Jun 21 05:32","Sep 22 22:00","Dec 21 19:51"
另存为 seasons.csv
现在使用这些代码：
$Seasons=Import-Csv path\to\seasons.csv | %
$MEqui=[DateTime]$([string]($_.Year )+$_.marequi)
$JSols=[DateTime]$([string]($_.Year )+$_.junsols)
$SEqui=[DateTime]$([string]($_.Year )+$_.sepequi)
$DSols=[DateTime]$([string]($_.Year )+$_.decsols)
[pscustomobject]@mequi=$mequi;jsols=$jsols;sequi=$sequi;dsols=$dsols
$Seasons | %
$MEqui=$MEqui.ToString(yyyy-MM-ddTHH:mm:ssZ)
$JSols=$JSols.ToString(yyyy-MM-ddTHH:mm:ssZ)
$SEqui=$SEqui.ToString(yyyy-MM-ddTHH:mm:ssZ)
$DSols=$DSols.ToString(yyyy-MM-ddTHH:mm:ssZ)
[pscustomobject]@MarchEquinox=$mequi;JuneSolstice=$jsols;SeptemberEquinox=$sequi;DecemberSolstice=$dsols | Export-Csv path\to\output.csv -NoTypeInformation -Append
其余步骤相同（只需将 $timetable1 替换为 $seasons），这种方法更好，因为从 csv 导入和导出到 csv 更容易且更可靠。
【问题讨论】：
ConvertFrom-String 提供基于分隔符的解析以及基于包含示例值的模板的启发式解析。基于分隔符的解析应用了您无法控制的自动类型转换，并且模板语言的文档记录很差，确切的行为难以预测 - 最好完全避免使用此 cmdlet。另请注意，它在 PowerShell [Core] v6+ 中不可用。
【参考方案1】：
对于模板问题，junsols 列似乎只有一个示例值 (Jun 21)，如果您更新它，您会发现它工作得很好。
一般来说，我会推荐以下模板来涵盖所有日期：
[int]year*:0000 [string]marequi:Mar 00 00:00 [string]junsols:Jun 00 00:00 [string]sepequi:Sep 00 00:00 [string]decsols:Dec 00 00:00
[int]year*:9999 [string]marequi:Mar 99 99:99 [string]junsols:Jun 99 99:99 [string]sepequi:Sep 99 99:99 [string]decsols:Dec 99 99:99
另外（作为旁注）：try to avoid using the increase assignment operator (+=) to create a collection 因为它是指数级的昂贵
【讨论】：
太棒了！你真的解决了这个问题！我已经确认它正在工作，我认为这可能是一个错误......说实话，我遵循了 Convertfrom-String 的 Microsoft 文档页面上的示例，它实际上并没有说明如何编写模板......以上是关于PowerShell - 一个与 convertfrom-string 相关的奇怪问题的主要内容，如果未能解决你的问题，请参考以下文章
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