For me, the issue seemed to be related to making sure that the time zone was set correctly TWO TIMES in the google calendar. There is a "general settings" tab that has a time zone setting. But there is also a calendar-specific time zone setting for each sub calendar. To check that it is set correctly,
1. Look at your list of calendars and subcalendars.
2. Right below that list, in very small type, are two words, "add" and "settings." Click on "settings."
3. Choose the tab that says "calendars." This will give you a list of all your calendars.
4. Click on the calendar you want to embed in your blog. This brings up a page where you establish the settings just for that one calendar. This is also the page where you can get the embed code that you will use to get the calendar through Tagul and into your blog.
5. On this calendar-specific settings page, look for the "calendar time zone" spot. Choose the time zone you want to show on the calendar you embed in your blog.
6. Double-check that it's set by looking down a couple of boxes for where it says "Embed this calendar." There, in a box, is the code that will determine how your calendar shows up in your blog. Look for a little code that says &ctz="timezone," where "timezone" is the timezone you want to show. For example, I'm in the mountain standard time zone, and in my embed code, it reads
<iframe src="https://www.google.com/calendar/embed?src=t18666r7179krc4t3nfb9f29k4%40group.calendar.google.com&ctz=America/Denver" style="border: 0" width="800" height="600" frameborder="0" scrolling="no"></iframe>
The ctz=America/Denver is what determines that when I broadcast this calendar, it shows the times in the mountain standard time zone.