rtcuseutc as sane default for VBox [GH-912]

CHANGELOG.md

@@ -44,6 +44,7 @@ IMPROVEMENTS:
   - Invalid settings are now caught and shown in a user-friendly way. [GH-1484]
   - Detect PuTTY Link SSH client on Windows and show an error. [GH-1518]
   - `vagrant ssh` in Cygwin won't output DOS path file warnings.
+  - Add `--rtcuseutc on` as a sane default for VirtualBox. [GH-912]
 
 BUG FIXES:
 

plugins/providers/virtualbox/action/sane_defaults.rb

@@ -25,6 +25,10 @@ module VagrantPlugins
           ]
           attempt_and_log(command, "Enabling the Host I/O cache on the SATA controller...")
 
+          # Use rtcuseutc so that the VM sees UTC time.
+          command = ["modifyvm", env[:machine].id, "--rtcuseutc", "on"]
+          attempt_and_log(command, "Enabling rtcuseutc...")
+
           if env[:machine].provider_config.auto_nat_dns_proxy
             @logger.info("Automatically figuring out whether to enable/disable NAT DNS proxy...")