The Journal project is the original 1SE calendar project.
It lets you add at least one second to your calendar each day, using a photo or video.
With a Pro subscription, you can create several Journal projects, such as one for each family member, your pet or a goal.
What the colored line on some days means
Here's how that looks on each platform:
 |  |
iOS | Android |
A teal or aqua line at the top of a day means your device library has something from that date that you haven't made into a snippet yet, and the icon in the corner tells you which: a video camera for at least one video or Live Photo, a still camera when there are only photos. Tap any of those days to see what's available. A grey line with no icon means there's nothing in your library for that date, and today is the day highlighted in orange. What do the colors in the calendar mean? covers every state.
You can select a moment from any video or photo stored on your device, regardless of the date. Tap the day you want to add a snippet and explore your library.
Your calendar grows with each new day.