Kadang-kadang kita perlu mengetahui suatu tanggal itu hari ke berapa dalam suatu tahun. Berikut ini cara menghitungnya dengan bahasa Python.

from datetime import datetime, timedelta
day_of_year = 265
start_of_year = datetime(2025, 1, 1)
target_date = start_of_year + timedelta(days=day_of_year - 1)
weekday_num = target_date.weekday()+1
print("weekday num", weekday_num)

source:

• The Art of Quantitative Finance vol 1 https://link.springer.com/book/10.1007/978-3-031-23873-4
• The Art of Quantitative Finance vol 2 https://link.springer.com/book/10.1007/978-3-031-23870-3
• The Art of Quantitative Finance vol 3 https://link.springer.com/book/10.1007/978-3-031-23867-3

Source: https://zachwills.net/how-to-use-claude-code-subagents-to-parallelize-development/