Merge pull request #326 from covin.

flatheadmill · flatheadmill · commit 323333dbd1f0 · 2020-01-28T10:46:12.000-06:00
Show positive nanosecond for dates prior 1970-01-01.
diff --git a/src/timezone.js b/src/timezone.js
@@ -250,7 +250,7 @@
     , j: function (date) { return Math.floor((date.getTime() - Date.UTC(date.getUTCFullYear(), 0)) / 864e5) + 1 }
     , s: function (date) { return Math.floor(date.getTime() / 1000) }
     , C: function (date) { return Math.floor(date.getUTCFullYear() / 100) }
-    , N: function (date) { return date.getTime() % 1000 * 1000000 }
+    , N: function (date) { return ((date.getTime() % 1000 + 1000) % 1000) * 1000000 }
     , m: function (date) { return date.getUTCMonth() + 1 }
     , Y: function (date) { return date.getUTCFullYear() }
     , y: function (date) { return date.getUTCFullYear() % 100 }
diff --git a/t/format/nanoseconds.t.js b/t/format/nanoseconds.t.js
@@ -1,8 +1,9 @@
-require('proof')(3, prove)
+require('proof')(4, prove)
 
 function prove (assert) {
     var tz = require('timezone'), util = require('../util')
     assert(tz(util.y2k, '%N'), '000000000', 'top of hour')
     assert(tz(util.utc(1980, 0, 1, 0, 0, 1, 999), '%N'), '999000000', 'last millisecond')
     assert(tz(util.utc(1980, 0, 1, 0, 0, 1, 3), '%N'), '003000000', 'nanoseconds')
+    assert(tz(util.utc(1969, 0, 1, 0, 0, 1, 42), '%N'), '042000000', 'ns from negative')
 }
