Two apps that I am using and highly recommend:
First, if you are a diary/journal user **Diarium** is an outstanding app that works with Windows, Mac, iPhone, and Android. It will sync across all platforms. I have tried many such journaling tools, and this one is the best, in my opinion.
Second, **Working Hours* is an app that works on all the above platforms allowing you to track your daily work and log tasks. As a pastor, I keep track of time spent working on ministry-related items (for accountability purposes). It provides reports and analytics, and the log can be exported to a spreadsheet. It syncs across all platforms.
You can read more about these apps here: