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 fine-tuned date & time of your post.
When you create a post in Post Builder:
In Step 1, you can define the generic date & time that will apply automatically to all the social media channels your post will be published for:
Then, in Fine-tune Each Channel, if necessary, you will be able to set a specific date and time for each social channel you have selected:
The date defined in the first panel, Set Post Details, is the generic date: similarly to how the generic copy & image/ video 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 & time are displayed throughout the app, i.e., on your dashboard and then List View, Calendar View & Post View. If you update the date & time of your post in the first panel of Post Builder under Set Post Details, that date & 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 Set Post Details panel rather than the Fine-tune Each Channel panel.