The Find Days Since the Start of Year Tool helps you calculate how many full days have passed between January 1st and any given date. Whether you’re working on date-based analytics, calendar metrics, or scheduling systems, this tool gives you a quick way to find the “day of year” count for any date you enter.
How to Use:
- Enter Dates: Type or paste one date per line into the input box, using the
YYYY-MM-DD
format. - Live Preview: The tool instantly calculates how many days have passed since January 1st of that same year.
- Import File: Use the Choose File button to load a list of dates from a
.txt
,.csv
, or other supported file. - Copy or Export: Click Copy Output to copy the result to clipboard or Export to File to download it.
- Clear All: Hit Clear All to reset the tool and start over.
What Find Days Since the Start of Year Tool can do:
- Calculates the number of days between January 1st and any valid date in the same year
- Supports multiple input dates, one per line
- Flags invalid entries as
Invalid date
- Displays the results live with dynamic output count
- Accepts safe file import formats like
.txt
,.csv
,.json
, and more
Example:
Input:
2024-01-01
2024-02-01
2024-03-15
2024-12-31
Output:
0 days
31 days
74 days
365 days
Common Use Cases:
Use this tool for building or debugging “day of year” calculations, creating countdowns or progress trackers, analyzing seasonality in data, or just understanding how far into the year a date falls. It’s helpful for developers, researchers, planners, and anyone working with date-based logic.
Useful Tools & Suggestions:
To get the full picture, Find Days Till the End of Year shows how much runway you’ve got left. And if you’re aiming for a particular event, Find Days Till a Specific Date lets you zero in on that target.