# Calculation

Dear all, thanks for all the good work,
I need some help
I have a date field where entrants input LNMP (the date the mother started
her monthly cycle)
I need to calculate weeks of amenorrhea - the formula for this is

• All you have to do is count the number of days there were from the
first day of the last menstrual cycle to the present day.(e.g.: March 20)
• Take the first date of the last menstrual period. (e.g.: January 10th)
• Deduct it from the number of dates in that month. (31-10=21)
• Add the remaining days to it. (21+ 28(Feb)+20(March)=69 days)
• Divide the number of days from 7. (69/7=9 weeks and 6 days)
• Then you have the amenorrahe weeks

any help will be much appreciated

Thanks

See decimal-date-time (.)

https://opendatakit.org/help/form-design/binding/
https://opendatakit.org/help/form-design/binding/

··· On Mon, Nov 23, 2015 at 8:33 AM, Ayoub Kakande wrote:

Dear all, thanks for all the good work,
I need some help
I have a date field where entrants input LNMP (the date the mother started
her monthly cycle)
I need to calculate weeks of amenorrhea - the formula for this is

• All you have to do is count the number of days there were from the
first day of the last menstrual cycle to the present day.(e.g.: March 20)
• Take the first date of the last menstrual period. (e.g.: January 10th
)
• Deduct it from the number of dates in that month. (31-10=21)
• Add the remaining days to it. (21+ 28(Feb)+20(March)=69 days)
• Divide the number of days from 7. (69/7=9 weeks and 6 days)
• Then you have the amenorrahe weeks

any help will be much appreciated

Thanks

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