Configure timezone with TZ env var. Resolves #109

src/log.ts

@@ -2,6 +2,25 @@ let requests = 0
 
 const LOG_HTML: boolean = process.env.LOG_HTML == 'true';
 
+function toIsoString(date: Date) {
+  // this function fixes Date.toISOString() adding timezone
+  let tzo = -date.getTimezoneOffset(),
+      dif = tzo >= 0 ? '+' : '-',
+      pad = function(num: number) {
+        let norm = Math.floor(Math.abs(num));
+        return (norm < 10 ? '0' : '') + norm;
+      };
+
+  return date.getFullYear() +
+      '-' + pad(date.getMonth() + 1) +
+      '-' + pad(date.getDate()) +
+      'T' + pad(date.getHours()) +
+      ':' + pad(date.getMinutes()) +
+      ':' + pad(date.getSeconds()) +
+      dif + pad(tzo / 60) +
+      ':' + pad(tzo % 60);
+}
+
 export default {
   incRequests: () => { requests++ },
   html(html: string) {
@@ -12,7 +31,7 @@ export default {
     {level: process.env.LOG_LEVEL || 'info',
       prefix(level: string) {
         const req = (requests > 0) ? ` REQ-${requests}` : '';
-        return `${new Date().toISOString()} ${level.toUpperCase()}${req}`
+        return `${toIsoString(new Date())} ${level.toUpperCase()}${req}`
       }
     }
   )