I have noticed that reminders do not sync correctly with the Windows client. I created a reminder for 16:30 on my Windows client, and synchronized. It appears as 15:30 on the web.

Steps to reproduce:
1. Create a task on the Windows Client
2. Assign a reminder time of 16:30 on the current day
3. Synchronize
4. View the task on the web and you will see a reminder time of 15:30

The other direction:
1. Create a task on the web client
2. Assign a reminder time of 16:30 on the current day
3. Synchronize the Windows client
4. View the task and you will see a reminder time of 17:30

The timezone on my Doit.im Account is set to GMT-5 Eastern Time (US & Canada). The timezone on my local Windows computer is also set to GMT-5 Eastern Time (US & Canada). However, we are currently in Daylight Savings Time here in the US, so I am effectively in GMT-4, which I suspect is the cause of the time bug.

I have attached screenshots of my Windows timezone settings as well as my web timezone settings, in case you may find it useful.