add Base.zero for data time types

JuliaGeo · Jan 13, 2025 · cab94be · cab94be
1 parent 37d124f
commit cab94be
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diff --git a/src/datetime.jl b/src/datetime.jl
@@ -161,6 +161,7 @@ pattern given in the `format` string.
             return $CFDateTime(p,_origintuple(dt))
         end
 
+        Base.zero(::Type{$CFDateTime}) = Millisecond(0)
 
         function _origin_period(dt::$CFDateTime{T,Torigintuple}) where {T,Torigintuple}
             Ti = _type(T)

diff --git a/test/test_time.jl b/test/test_time.jl
@@ -554,3 +554,12 @@ MYMD = CFTime.datetuple_ymd(T,Z)
 
 Z2 = CFTime.datenum(T,MYMD...)
 @test Z == Z2
+
+@testset "zero" begin
+    @test zero(DateTimeAllLeap) == CFTime.Millisecond(0)
+    @test zero(DateTimeNoLeap) == CFTime.Millisecond(0)
+    @test zero(DateTimeJulian) == CFTime.Millisecond(0)
+    @test zero(DateTimeJulian) == CFTime.Millisecond(0)
+    @test zero(DateTime360Day) == CFTime.Millisecond(0)
+    @test zero(DateTime360Day) == CFTime.Millisecond(0)
+end