What format does the date range need to be in?

Enter the range on the first line as "YYYY-MM-DD to YYYY-MM-DD", for example "2024-01-01 to 2024-01-11", then the number of intervals on the second line.

What happens when the total span doesn't divide evenly by the interval count?

Each boundary is rounded independently to the nearest whole day, so most sub-ranges end up the same length while at most a few differ by a single day. The first and last boundaries always match your original start and end dates exactly.

Can I split a range into more intervals than it has days?

Yes, though some sub-ranges will end up zero-length (the same start and end date) once the interval count exceeds the number of days in the range, since there simply aren't enough days to spread further.

Is there a limit on the number of intervals?

Up to 10,000 intervals in a single run, which comfortably covers sprint planning, billing cycles, and academic term schedules.

Date Interval Splitter - Divide a Date Range into Equal Parts

Overview

Introduction

Breaking a long date range into equal chunks comes up constantly when planning: splitting a project timeline into sprints, a billing year into invoicing periods, or a semester into grading windows.

This tool takes a start-to-end date range and a target count, then returns that many equal-length sub-ranges spanning the whole period.

What Is Split Date into Intervals?

A date range splitter that divides a single "start to end" range into a specified number of consecutive, non-overlapping sub-ranges of roughly equal length.

It works entirely on calendar days, so every boundary lands on a real date rather than a fractional day.

How Split Date into Intervals Works

The tool parses the start and end dates and computes the total number of days between them.

It then computes each boundary by scaling that total by the boundary's position among the requested intervals and rounding to the nearest whole day, so the sequence of sub-ranges tiles the original range exactly from start to end.

When To Use Split Date into Intervals

Use it to carve a project timeline into evenly spaced sprints or milestones, or a subscription year into equal billing windows.

It's also handy for splitting a data export window into smaller date-bounded batches when an API or report only accepts a limited range per request.

Often used alongside Generate a Date Sequence and Generate a Time Sequence.

Features

Advantages

Every boundary is a real calendar date, no fractional days in the output.
Handles totals that don't divide evenly by rounding boundaries independently, keeping sub-ranges as close to equal as whole days allow.
Processes up to 10,000 intervals in one pass.

Limitations

Only whole-day granularity is supported, sub-ranges can't be split at a specific time of day.
When the interval count is larger than the number of days in the range, some sub-ranges come out zero-length.

Examples

Splitting a 10-day range into 5 parts

Input

2024-01-01 to 2024-01-11
5

Output

2024-01-01 to 2024-01-03
2024-01-03 to 2024-01-05
2024-01-05 to 2024-01-07
2024-01-07 to 2024-01-09
2024-01-09 to 2024-01-11

The 10-day span divides evenly into five 2-day sub-ranges.

Best Practices & Notes

Best Practices

Double-check the interval count against the range length first, an interval count far larger than the day count produces mostly zero-length sub-ranges.
Feed the output straight into a scheduling spreadsheet or ticketing tool since each line is already a clean, sortable range.

Developer Notes

Boundaries are computed as `start + round(i * totalDays / count) days` for each i from 0 to count, so consecutive sub-ranges share a boundary and the whole sequence tiles the input range with no gaps or overlaps; this mirrors how you'd bucket a continuous span into discrete calendar-day segments without accumulating rounding drift at the far end.

Split Date into Intervals Use Cases

Splitting a project timeline into evenly spaced sprints
Dividing a subscription or fiscal year into equal billing periods
Breaking a large date-bounded data export into smaller request windows

Common Mistakes

Swapping the start and end dates, which the tool rejects since the end must come after the start.
Forgetting the required "to" separator between the two dates in the range line.

Tips

Pair this with Date Sequence Generator when you need individual dates (like weekly checkpoints) rather than ranges.
If you need exact equal-length sub-ranges only, pick an interval count that evenly divides the total number of days.

Split Date into Intervals