adds "Etc/UTC" for load_local

src/time/location.cr

@@ -47,16 +47,16 @@ require "./location/loader"
 # Time::Location.local = Time::Location.load("America/New_York")
 # ```
 class Time::Location
-  # `InvalidLocationNameError` is raised if a location name cannot be found in
-  # the time zone database.
-  #
-  # See `Time::Location.load` for details.
+# `InvalidLocationNameError` is raised if a location name cannot be found in
+# the time zone database.
+#
+# See `Time::Location.load` for details.
   class InvalidLocationNameError < Exception
     getter name, source
 
     def initialize(@name : String, @source : String? = nil)
       msg = "Invalid location name: #{name}"
-      msg += " in #{source}" if source
+        msg += " in #{source}" if source
       super msg
     end
   end
@@ -74,9 +74,9 @@ class Time::Location
   # Some zones have a `name` or abbreviation (such as `PDT`, `CEST`).
   # For an unnamed zone the formatted offset should be used as name.
   struct Zone
-    # This is the `UTC` time zone with offset `+00:00`.
-    #
-    # It is the only zone offset used in `Time::Location::UTC`.
+  # This is the `UTC` time zone with offset `+00:00`.
+  #
+  # It is the only zone offset used in `Time::Location::UTC`.
     UTC = new "UTC", 0, false
 
     # Returns the offset from UTC in seconds.
@@ -94,10 +94,10 @@ class Time::Location
     # Raises `InvalidTimezoneOffsetError` if *seconds* is outside the supported
     # value range `-86_400..86_400` seconds (`-24:00` to `+24:00`).
     def initialize(@name : String?, @offset : Int32, @dst : Bool)
-      # Maximum offsets of IANA time zone database are -12:00 and +14:00.
-      # +/-24 hours allows a generous padding for unexpected offsets.
-      # TODO: Maybe reduce to Int16 (+/- 18 hours).
-      raise InvalidTimezoneOffsetError.new(offset) if offset >= SECONDS_PER_DAY || offset <= -SECONDS_PER_DAY
+    # Maximum offsets of IANA time zone database are -12:00 and +14:00.
+    # +/-24 hours allows a generous padding for unexpected offsets.
+    # TODO: Maybe reduce to Int16 (+/- 18 hours).
+        raise InvalidTimezoneOffsetError.new(offset) if offset >= SECONDS_PER_DAY || offset <= -SECONDS_PER_DAY
     end
 
     # Returns the name of the zone.
@@ -111,7 +111,7 @@ class Time::Location
     # `offset` in seconds and `"DST"` if `#dst?`, otherwise `"STD"`.
     def inspect(io : IO) : Nil
       io << "Time::Location::Zone("
-      io << @name << ' ' unless @name.nil?
+        io << @name << ' ' unless @name.nil?
       format(io)
       io << " (" << offset << "s)"
       if dst?
@@ -131,15 +131,15 @@ class Time::Location
       sign, hours, minutes, seconds = sign_hours_minutes_seconds
 
       io << sign
-      io << '0' if hours < 10
+        io << '0' if hours < 10
       io << hours
-      io << ':' if with_colon
-      io << '0' if minutes < 10
+        io << ':' if with_colon
+        io << '0' if minutes < 10
       io << minutes
 
       if with_seconds == true || (seconds != 0 && with_seconds == :auto)
-        io << ':' if with_colon
-        io << '0' if seconds < 10
+          io << ':' if with_colon
+          io << '0' if seconds < 10
         io << seconds
       end
     end
@@ -185,7 +185,7 @@ class Time::Location
       else
         io << " DST"
       end
-      io << " UTC" if utc?
+        io << " UTC" if utc?
       io << ')'
     end
   end
@@ -282,8 +282,8 @@ class Time::Location
     when "Local"
       local
     when .includes?(".."), .starts_with?('/'), .starts_with?('\\')
-      # No valid IANA Time Zone name contains a single dot,
-      # much less dot dot. Likewise, none begin with a slash.
+    # No valid IANA Time Zone name contains a single dot,
+    # much less dot dot. Likewise, none begin with a slash.
       raise InvalidLocationNameError.new(name)
     else
       if zoneinfo = ENV["ZONEINFO"]?
@@ -348,7 +348,7 @@ class Time::Location
   #   `Location::UTC` is returned.
   def self.load_local : Location
     case tz = ENV["TZ"]?
-    when "", "UTC"
+    when "", "UTC", "Etc/UTC"
       return UTC
     when Nil
       if localtime = Crystal::System::Time.load_localtime
@@ -424,7 +424,7 @@ class Time::Location
         transition.when > unix_seconds
       end || transitions.size
 
-      tx_index -= 1 unless tx_index == 0
+        tx_index -= 1 unless tx_index == 0
       transition = transitions[tx_index]
       range_end = transitions[tx_index + 1]?.try(&.when) || Int64::MAX
 
@@ -456,7 +456,7 @@ class Time::Location
       while index > 0
         index -= 1
         zone = zones[index]
-        return zone unless zone.dst?
+          return zone unless zone.dst?
       end
     end
 
@@ -479,4 +479,4 @@ class Time::Location
   def fixed? : Bool
     zones.size <= 1
   end
-end
+end