Support for ORA_SDTZ env variable in Thin mode

Author: sharadraju

lib/thin/protocol/messages/auth.js

@@ -143,19 +143,23 @@ class AuthMessage extends Message {
   }
 
   getAlterTimezoneStatement() {
-    let sign;
-    const date = new Date();
-    const timezoneMinutes = date.getTimezoneOffset();
-    let tzHour = Math.trunc(timezoneMinutes / 60);
-    const tzMinutes = Math.abs((timezoneMinutes - tzHour * 60) % 60);
-    if (tzHour < 0) {
-      sign = '+';  // getTimezoneOffset() = localtime - timeUTC
-      tzHour = -tzHour;
+    let sign, tzRepr;
+    if (process.env.ORA_SDTZ) {
+      tzRepr = process.env.ORA_SDTZ;
     } else {
-      sign = '-';
+      const date = new Date();
+      const timezoneMinutes = date.getTimezoneOffset();
+      let tzHour = Math.trunc(timezoneMinutes / 60);
+      const tzMinutes = Math.abs((timezoneMinutes - tzHour * 60) % 60);
+      if (tzHour < 0) {
+        sign = '+';  // getTimezoneOffset() = localtime - timeUTC
+        tzHour = -tzHour;
+      } else {
+        sign = '-';
+      }
+      tzHour = tzHour.toLocaleString('en-US', {minimumIntegerDigits: 2});
+      tzRepr = `${sign}${tzHour}:${tzMinutes}`;
     }
-    tzHour = tzHour.toLocaleString('en-US', {minimumIntegerDigits: 2});
-    const tzRepr = `${sign}${tzHour}:${tzMinutes}`;
     return `ALTER SESSION SET TIME_ZONE ='${tzRepr}'\x00`;
   }