Date and Age Calculator
Pricing
from $0.01 / 1,000 results
Date and Age Calculator
Calculate age from a birth date, the number of days between two dates, or add and subtract years, months, weeks and days. Every row returns years, months, days, running totals, weekdays, the next birthday and the zodiac sign. Runs fully offline with no API key.
Pricing
from $0.01 / 1,000 results
Rating
0.0
(0)
Developer
Mangudäi
Maintained by CommunityActor stats
0
Bookmarked
2
Total users
1
Monthly active users
2 days ago
Last modified
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Date and Age Calculator: age, days between dates, add or subtract time
Work out how old someone is, how many days sit between two dates, or what the date will be 90 days from now. Every calculation runs offline on the Python standard library, so there is no API key, no rate limit, and nothing that can break when a website changes.
Send one calculation or a hundred in a single run. Each one comes back as a row in a clean table you can export to CSV, Excel, JSON or XML.
What it does
Four calculation types, set with the type field:
age gives the age from a birth date to today or to any reference date, plus the next birthday, days until it, the age being turned, the western zodiac sign and the Chinese zodiac animal.
difference gives the full gap between two dates: calendar years, months and days, plus totals in months, weeks, days, hours, minutes and seconds.
add moves a date forward by years, months, weeks, days, hours or minutes.
subtract moves a date backward by the same units.
Month arithmetic follows the calendar rather than a fixed 30 days, so 31 January plus one month lands on 28 or 29 February, and a 29 February birthday rolls to 1 March in non-leap years.
Input
| Field | Type | Description |
|---|---|---|
calculations | array | One object per calculation. Required. |
referenceDate | string | Treated as today for age rows with no toDate. Defaults to the current UTC date. |
Fields inside each calculation object:
| Field | Description |
|---|---|
type | age, difference, add or subtract |
label | Your own name for the row, copied to the output |
date | Start date, or birth date for age. YYYY-MM-DD or a full ISO timestamp |
toDate | Second date for difference, or the as-of date for age |
years, months, weeks, days, hours, minutes | Duration for add and subtract |
Example input:
Output
One row per calculation:
| Field | Description |
|---|---|
label | Your label |
type | Calculation type |
startDate, endDate | The two dates used |
resultDate | The computed date for add and subtract |
years, months, days | Calendar breakdown |
humanReadable | The same breakdown in words, for example 36 years, 2 months and 3 days |
totalMonths, totalWeeks, totalDays, totalHours, totalMinutes, totalSeconds | Whole-unit totals |
weeksAndDays | Totals as weeks plus leftover days |
startWeekday, endWeekday | Day of the week for each date |
nextBirthday, daysUntilNextBirthday, ageAtNextBirthday | Birthday fields, age type only |
zodiacSign, chineseZodiac | Signs from the birth date, age type only |
datesReversed | True when the second date falls before the first |
error | Reason a row failed, otherwise empty |
Sample row:
Uses
Age verification and eligibility checks on a list of birth dates. Contract, lease and subscription lengths. Invoice and payment due dates. Project timelines and countdowns to a launch. Retention cohorts measured in days since signup. Bulk cleaning of date columns exported from a CRM.
Notes
A bad date does not stop the run. That row comes back with an error message and the rest continue.
All arithmetic is done in naive UTC. Timestamps carrying an offset are converted to UTC first.
Billing is pay per event: a small charge per actor start and a charge per result row.
