feat: Relax UnixTime construction from String

Author: Beforerr

src/UnixTimes.jl

@@ -63,14 +63,34 @@ UnixTime(x::Date, y::Time) =
 const DATEFORMAT = dateformat"yyyy-mm-ddTHH:MM:SS.sss"
 
 function UnixTime(s::AbstractString)
-    try
-        @assert length(s) == 29
-        dt = DateTime(chop(s; tail=6), DATEFORMAT)
-        ns = Nanosecond(parse(Int, last(s, 6)))
-        UnixTime(dt) + ns
-    catch
-        throw(ArgumentError("Invalid UnixTime string"))
+    # Find the decimal point if it exists
+    dot_idx = findfirst('.', s)
+
+    # No fractional seconds, parse as DateTime
+    isnothing(dot_idx) && return UnixTime(DateTime(s, DATEFORMAT))
+
+    # Split into datetime and fractional parts
+    dt_part = @view s[1:(dot_idx - 1)]
+    frac_part = @view s[(dot_idx + 1):end]
+
+    # Parse the datetime part
+    dt = DateTime(dt_part, DATEFORMAT)
+
+    # Parse fractional seconds (can be 1-9 digits)
+    if isempty(frac_part) || !all(isdigit, frac_part)
+        throw(ArgumentError("Invalid fractional seconds in UnixTime string"))
     end
+
+    # Convert fractional seconds to nanoseconds
+    # Pad or truncate to 9 digits (nanosecond precision)
+    frac_digits = length(frac_part)
+    ns_value = if frac_digits <= 9
+        parse(Int, frac_part) * 10^(9 - frac_digits)
+    else
+        parse(Int, frac_part[1:9])
+    end
+
+    return UnixTime(dt) + Nanosecond(ns_value)
 end
 
 function Base.convert(::Type{UnixTime}, x::DateTime)

test/runtests.jl

@@ -48,9 +48,22 @@ end
     x = UnixTime(2020, 1, 2, 3, 4, 5, 6, 7, 8)
     @test string(x) == "2020-01-02T03:04:05.006007008"
     @test UnixTime(string(x)) == x
-    @test_throws ArgumentError UnixTime("2025-01-28T15:49:36.5901397023")
-    @test_throws ArgumentError UnixTime("2025-01-28T15:49:36.59013970")
-    @test_throws ArgumentError UnixTime(repeat("a", 29))
+
+    # Test various string formats
+    @test UnixTime("2020-01-02T03:04:05") == UnixTime(2020, 1, 2, 3, 4, 5)
+    @test UnixTime("2020-01-02T03:04:05.1") == UnixTime(2020, 1, 2, 3, 4, 5, 100)
+    @test UnixTime("2020-01-02T03:04:05.12") == UnixTime(2020, 1, 2, 3, 4, 5, 120)
+    @test UnixTime("2020-01-02T03:04:05.123") == UnixTime(2020, 1, 2, 3, 4, 5, 123)
+    @test UnixTime("2020-01-02T03:04:05.1234") == UnixTime(2020, 1, 2, 3, 4, 5, 123, 400)
+    @test UnixTime("2020-01-02T03:04:05.123456") == UnixTime(2020, 1, 2, 3, 4, 5, 123, 456)
+    @test UnixTime("2020-01-02T03:04:05.123456789") == UnixTime(2020, 1, 2, 3, 4, 5, 123, 456, 789)
+
+    # Test truncation of extra digits
+    @test UnixTime("2020-01-02T03:04:05.1234567890") == UnixTime(2020, 1, 2, 3, 4, 5, 123, 456, 789)
+
+    # Test invalid formats
+    @test_throws ArgumentError UnixTime("2020-01-02T03:04:05.")
+    @test_throws ArgumentError UnixTime("2020-01-02T03:04:05.abc")
 end
 
 @testset "arithmetic" begin