New Square Chambers is pleased to make available the following calculator, which is freeware and can be used from this website without charge. Full instructions for using this Day Calculator, and important legal notices, are further down this page. Alternative calendar options below.
Today is
Date range
I want to calculate the number of days between two particular dates:
Answer
Excluding the starting date but including the ending date.
Add or subtract days
I want to add or subtract a particular number of days to or from a particular date:
Answer
Excluding the starting date but including the ending date.
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Instructions
To calculate the number of days between any two dates (ie. the left hand form above):
Step 1 – Choose your starting date
Select the starting date of your choice using the drop-down arrows next to each selection box. When you open the Day Calculator, the date is automatically set to today’s date. As the calculator takes today’s date from your system clock, it is important to make sure that your system date is correctly set for this function to work properly.Step 2 – Choose your ending date
Select the ending date of your choice using the drop-down arrows next to each selection box. When you open the Day Calculator, the date is automatically set to today’s date. As the calculator takes today’s date from your system clock, it is important to make sure that your system date is correctly set for this function to work properly.Step 3 – Calculate
Press the button marked “Calculate” to carry out the calculation. The number of days difference will be displayed at the bottom of the form. Note that the calculation excludes the starting date itself (ie. day number 1 is the day after your starting date) but includes the ending date.To add or subtract a chosen number of days to or from any date (ie. the right hand form above):
Step 1 – Choose your starting date
Select the starting date of your choice using the drop-down arrows next to each selection box. When you open the Day Calculator, the date is automatically set to today’s date. As the calculator takes today’s date from your system clock, it is important to make sure that your system date is correctly set for this function to work properly.Step 2 – Choose whether to add or subtract
Either select the radio button marked “Add” or the radio button marked “Subtract”.Step 3 – Type in the number of days to add or subtract
This must be a whole number.Step 4 – Calculate
Press the button marked “Calculate” to carry out the calculation. The new ending date will be displayed at the bottom of the form, including the day of the week. Note that the calculation excludes the starting date itself (ie. day number 1 is the day after your starting date) but includes the ending date. -
Legal notices
Disclaimer
Every effort has been made to ensure that this calculator functions correctly, and members of Chambers themselves use it. However, no liability can be accepted for any errors which might arise in its operation, and use is entirely at the user’s risk.
Copyright
Copyright in this calculator vests in the Head of Chambers for the time being of New Square Chambers. However, this calculator is freeware and may be used on this website without charge for any commercial or non-commercial purpose.
Feedback
If you have any comments (whether good or bad) on this calculator or if you spot any errors, New Square Chambers would be only too pleased to hear about them. Please e-mail us. Thank you.
© Copyright New Square Chambers 2026 | Head of Chambers at New Square Chambers | version 3.1