There might a few reasons why that happened:
1. Time zones have not been set consistently in your Account and your Calendar Settings page(s).
2. The generic date & time of your post got mixed up with the customized date & time of your post.
When you create a post in Post Builder:
In Step 1, you can define the generic date and time that will apply automatically to all the social media channels your post will be published for:
Then if necessary in the Fine-Tune Content step, you will be able to set a specific date and time for each social channel you have selected:
The date defined in the first Generic Content panel is the generic date: similarly to how the generic captions and images/videos work, it will be applied to your post by default, unless you override it in the fine-tuning panel for a specific channel.
For simplicity, the generic date and time are displayed throughout the app, i.e., on your dashboard and then List View, Calendar View, and Post View. If you update the date and time of your post in the first panel of Post Builder under the Generic Content step, that date and time will be displayed accordingly everywhere in Loomly.
Unless you need to set a specific date for each channel, we recommend that you set the date & time of your post in the Generic Content panel rather than the Fine-Tune Content panel.