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February 5, 2021 08:06
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AIRAC dates generator - enumerates AIRAC cycles: previous, current and next.
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Function Out-AIRACCycles | |
{ | |
Param ( [DateTime] $currentDay = ( Get-Date ) | |
, [DateTime] $initialDay = ( Get-Date -Year 2015 -Month 1 -Day 8 ) | |
, $interval = 28 | |
, $culture = [System.Globalization.CultureInfo]::GetCultureInfo("en-US") ) | |
$offset = (New-TimeSpan -Start $initialDay -End ( Get-Date -Year ( $currentDay.Year - 1 ) -Month 1 -Day 1 ) ).Days | |
$offset .. ( $offset + 365 * 3 ) | | |
? { $_ % 28 -eq 0 } | | |
select @{ N="date"; E={ $initialDay.AddDays( $_ ) } } | | |
select -expand date | | |
group Year | | |
% { | |
$year = $_.Name | |
$dates = $_.Group | |
1 .. $_.Count | select @{ N="Cycle"; E={ $_ } }, | |
@{ N="Ident"; E={ "$($year.Substring(2,2))$($_.ToString().PadLeft(2, '0' ) )" } }, | |
@{ N="EffectiveDate"; E={ Get-Date $dates[ $_-1 ] -Format d } }, | |
@{ N="AIRAC"; E={ $dates[ $_-1 ].ToString("dd MMM yy", $culture).ToUpperInvariant() } }, | |
@{ N="distance"; E={ ( New-TimeSpan -Start $currentDay -End $dates[ $_-1 ] ).Days } } | |
} | | |
? { [Math]::Abs( $_.distance ) -lt $interval * 2 } | | |
select Cycle, Ident, EffectiveDate, AIRAC -First 3 | |
} |
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Usage samples
No arguments, no pipes. It outputs AIRAC cycles for today.
Specific date (i.e.: 5th january 2020):
Only current cycle:
Only next cycle: