This Timestamp Tracker app is an easy to use, one-tap add, timestamp recorder and tracker. When you open or launch the app, a timestamp is automatically created. You can add further timestamps with a single tap. You can easily add a note to any entry.

It has buttons to:
* Add a timestamp
* Export timestamps data as .csv
* Show/hide milliseconds
* Clear the timestamps (some or all timestamps)
* Show app info.

It also has buttons to add/edit/view a note to/of any timestamp entry, and to delete any timestamp entry. Tap on timestamp entry is an additional way to add/edit/view the note of that entry. Maximum note length is 500 characters.

In the main list of timestamps page, it shows duration from previous timestamp and if a note has been added to the timestamp entry, it shows the initial part of the note.

The app will display a hardcoded (100) maximum number of timestamps. A warning is shown when user approaches the limit - timestamps full. When a timestamp is attempted to be added but the timestamps data limit has already been reached - timestamps full - a suitable message is shown. User has the option to clear some or all timestamps after which new timestamps can be added.

This app is useful to quickly and easily record timestamps and also to capture typically small break duration or even small task duration. The note facility provides a way to record what the associated activity was. The app supports light and dark modes and uses the device settings for it.

Note that if MS Off (hide milliseconds) option is chosen, milliseconds are still shown in Edit Note modal. Further, the interval calculation still uses the milliseconds, and rounds the seconds figure based on milliseconds difference. This results in interval sometimes being different by 1 second from simple subtraction of the later timestamp (rounded seconds) from its immediately previous timestamp (rounded seconds). For more precision, use MS On (show milliseconds) and in this case, interval will be same as subtraction of the later timestamp from its immediately previous timestamp.

The Export csv file for both options of MS On and Off (Show and hide milliseconds) has timestamp information (with or without milliseconds) in format suitable to be read by Microsoft Excel as a date time value. To format the date time cells you may use Format Cells -> Category: Custom -> Type:
* Shows milliseconds: dd-mm-yyyy hh:mm:ss
* Does not show milliseconds: dd-mm-yyyy hh:mm:ss.000

User can then do subtraction of Excel date-time cells to get the time interval as hours, minutes, seconds (and optionally milliseconds). The Excel cell formats to show such time interval values are:
* Shows milliseconds: [h]:mm:ss.000
* Does not show milliseconds: [h]:mm:ss

Showing days in time interval seems to be complex in Excel. So a 50 hour difference using above formats will show as 50 (hours) and not 2 days and 2 hours.

This feature of exporting data via csv to Excel allows the user to easily remove unwanted entries and so focus only on needed entries. Further intervals between non-consecutive timestamps can be easily calculated using suitable Excel simple cells subtraction formula.