Sometimes, after you installing new blogger template, you will see "Undefined" date. So, how to fix this problem?
Method 1: [go to Method 2]
1. Goto blogger.com & login
2. On Dashboard, click Layout > Page Elements

3. Edit Blog Posts 
4. Change timestamp format from normal time to long date
from
to
5. Save
Method 2: [go to Method 1]
1. Goto blogger.com & login
2. On Dashboard, click Settings > Formatting

3. Change timestamp format from normal time to long date
from
to
4. Save Settings
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