DaysKeeper 4+

This is an app that displays the number of days that have passed since a certain date and the number of days remaining until a certain date.
By registering dates of interest, such as anniversaries or events, you can easily check the number of days from that date.

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# Date
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Example of a date

Birthday
Anniversary
Planned travel date
Car purchase date
The day I started keeping a pet
The day I sowed the flower seeds
Historical date

You can attach photos and notes to a certain date, and set colors and tags to make it easier to find.
It also supports dark mode.

You can add it to your calendar and reminders so you don't forget important dates.

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# Days
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Since you can freely set the base date, you can list the number of days other than today.
You can also always display today at the top of the date list.
You can sort the display order by date, number of days, or name.

Since you can freely set the number of days, it is useful to find out the date of the day that has passed from a certain date.

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# Notification
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You can set notifications for the same day or the day before a certain date.
You can set notifications for the number of days you have registered or for a number of well-defined days. (Premium feature)

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# Others
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You can sync with multiple devices with iCloud.

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# About subscriptions and paid features
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Please refer to the following for the terms and conditions for using subscriptions and paid functions.

1. Privacy Policy: https://gsoft.jp/privacypolicy/
2. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/