cgeo: Geokrety logging doesn't work when logging from timezone ahead of CET

To Reproduce: Steps to reproduce the behavior:

1. Open some cache (I’m in SU caches)
2. Save the log with 'write note type"
3. Use Geokrety to set all as visited
4. Send the log

Cgeo will show “logging GK”, but this will be really really quick and no log will be added to GK.

I first though it doesn’t work just for “write note” logs, but today it didn’t for for “found” logs as well…

Version of c:geo used: You will find the c:geo version in c:geo Menu -> About c:geo

Is the problem reproducible: Yes / often

Screenshots: You may attach screenshots if applicable and helpful to explain your problem

System information:

Attach system information here if available (see c:geo Menu -> About c:geo -> Swipe right to System)
Keep the apostrophe at beginning and end to have it properly formatted

Additional context: e.g. Reference to other issues, projects, sources, etc.