Pick the correct timezoneoffset for the day in question

Calculating the timezoneoffset for the current date really makes no sense
whatsoever when displaying a time that isn't "now".

Fixes #605

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/helpers.h b/helpers.h
index f74d44939..06a431779 100644
--- a/helpers.h
+++ b/helpers.h
@@ -27,7 +27,7 @@ void set_default_dive_computer(const char *vendor, const char *product);
 void set_default_dive_computer_device(const char *name);
 QString getSubsurfaceDataPath(QString folderToFind);
 extern const QString get_dc_nickname(const char *model, uint32_t deviceid);
-int gettimezoneoffset();
+int gettimezoneoffset(time_t when = 0);
 int parseTemperatureToMkelvin(const QString &text);
 QString get_dive_date_string(timestamp_t when);
 QString get_short_dive_date_string(timestamp_t when);