Yes, one can rebalance only on the first Wednesday of the month. There's not a built in function like
date_rules.month_start(), but by fetching the backtest date and doing some comparisons, you can get there. Something like this.
def rebalance(context, data):
Place user code here.
today = get_datetime()
if (today.day <= 7) and (today.weekday() == 2):
# Today is first Wednesday (ie weekday==2) so continue
# Not the first Wednesday so return
# Put any code here
Checkout the attached algo. It logs the weekday for verification.
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