Dynamically build rebar3 if needed

Also tweaked `tz-erl` with some proposed updates from
https://github.com/choptastic/qdate_localtime/pull/1

.gitignore

@@ -3,3 +3,4 @@ _build/
 *~
 src/tz_index.erl
 *.sw?
+rebar3

Makefile

@@ -1,11 +1,24 @@
-all:
+all: rebar3
 	./rebar3 compile
 
-check:
+check: rebar3
 	./rebar3 eunit
 
-dialyzer:
+dialyzer: rebar3
 	./rebar3 dialyzer
 
-publish:
+publish: rebar3
 	./rebar3 hex publish
+
+rebar3:
+	@(echo "Building rebar3...")
+	@(rm -fr tmp)
+	@(mkdir -p tmp)
+	@(cd tmp && \
+		git clone https://github.com/erlang/rebar3 && \
+		cd rebar3 && \
+		./bootstrap)
+	@(echo "Moving rebar3 executable locally (NOT installing system-wide)")
+	@(mv tmp/rebar3/rebar3 .)
+	@(echo "Cleaning up rebar3 remnants")
+	@(rm -fr tmp)

README.md

@@ -1,21 +1,21 @@
 ## NOTE
 
-This is a fork of
-[erlang_localtime](https://github.com/dmitryme/erlang_localtime), modified
-specifically for compatibility with
+This is a fork of the excellent library,
+[erlang_localtime](https://github.com/dmitryme/erlang_localtime). The purpose
+of this fork is specifically for compatibility with
 [qdate](https://github.com/choptastic/qdate).  The two are mostly compatible,
-but have diverged a bit over the years.  The qdate tests will not pass if the
-original erlang_localtime dependency is used due to some subtle differences to
-attempt to make qdate a little bit smarter.
+but have diverged slightly over the years.  The qdate tests will not pass if the
+original `erlang_localtime dependency` is used due to some subtle differences
+to attempt to make qdate a little bit smarter.
 
 #### Public exports
 
-* utc_to_local(DateTime, Timezone) - converts UTC time to local according to specified Timezone
-* local_to_utc(DateTime, Timezone) - converts local time to UTC
-* local_to_local(DateTime, TimezoneFrom, TimezoneTo) - converts local time to local
-* tz_name(DateTime, Timezone) - returns a timezone name (E.g. MSK, MSD, etc)
-* tz_shift(DateTime, Timezone) - returns time difference between local datetime and GMT
-* tz_shift(DateTime, TimezoneFrom, TimezoneTo) - returns time difference between local datetime and required timezone
+* `utc_to_local(DateTime, Timezone)` - converts UTC time to local according to specified Timezone
+* `local_to_utc(DateTime, Timezone)` - converts local time to UTC
+* `local_to_local(DateTime, TimezoneFrom, TimezoneTo)` - converts local time to local
+* `tz_name(DateTime, Timezone)` - returns a timezone name (E.g. MSK, MSD, etc)
+* `tz_shift(DateTime, Timezone)` - returns time difference between local datetime and GMT
+* `tz_shift(DateTime, TimezoneFrom, TimezoneTo)` - returns time difference between local datetime and required timezone
 Where
 DateTime = {date(), time()}
 TimeZone(To, From) = String(). E.g. “Europe/Moscow”, “America/NewYork”. Or abbreviations "MSK", "MSD", etc. Note:

db/tz-erl

@@ -459,11 +459,16 @@ sub on_to_day_of_month {
   my $day;
   if ($on =~ m/^\d+$/) {
     $day = $on;
+	print "Day extracted via regex to: $day\n";
   } else {
     my ($desired_dow, $time_base);
     if ($on =~ m/^(\w+)>=(\d+)$/) {
       $desired_dow = $dow_from_name{$1}; my $desired_day = $2;
       $time_base = timelocal(0, 0, 0, $desired_day, $month, $year);
+	  print "Regex: $on => desired_dow: $desired_dow. Time_base: $time_base\n";
+    } elsif ($on =~ m/^(\w+)<=(\d+)$/) {
+	  $desired_dow = $dow_from_name{$1}; my $desired_day = $2;
+	  $time_base = timelocal(0, 0, 0, $desired_day, $month, $year);
     } elsif ($on =~ m/^last(\w+)$/) {
       $desired_dow = $dow_from_name{$1};
       # One week before the beginning of the next month.
@@ -472,7 +477,12 @@ sub on_to_day_of_month {
       die "match $on failed";
     }
     ($day, my $dow) = (localtime($time_base))[3,6];
-    if ($dow != $desired_dow) { $day += (DPW + $desired_dow - $dow) % DPW; }
+	print "Current Day: $day\n";
+	print "Comparing $dow = $desired_dow\n";
+    if ($dow != $desired_dow) {
+		$day += (DPW + $desired_dow - $dow) % DPW;
+	}
+	print "After comparison: Current Day: $day\n";
   }
 
   return $day;
@@ -511,6 +521,7 @@ sub last_active_epoch {
   }
 
   my $day = on_to_day_of_month($on, $year, $month);
-  return timelocal(0, 0, 0, $day, $month, $year);
+  print "On=$on, Year=$year, Month=$month ====> Day=$day\n";
+  return timelocal_nocheck(0, 0, 0, $day, $month, $year);
 }
 

rebar.lock

@@ -1 +0,0 @@
-[].