How can I subtract or add 100 years to a datetime field in the database in Django?
I would use the relativedelta
function of the dateutil.relativedelta
package, which will give you are more accurate 'n-years ago' calculation:
from dateutil.relativedelta import relativedelta
import datetime
years_ago = datetime.datetime.now() - relativedelta(years=5)
Then simply update the date
field as others have shown here.
Use timedelta. Something like this should do the trick:
import datetime
years = 100
days_per_year = 365.24
hundred_years_later = my_object.date + datetime.timedelta(days=(years*days_per_year))