| """Bank holidays of England and Wales (the calendar of the Great Britain price), computed - no package: Easter (calendar_features.easter), the |
| Monday rules and the substitute days. Scotland differs in a few days (2 January, the August holiday); a missing local holiday costs a little |
| accuracy on one day a year, this is a model feature and not a statement of law.""" |
| from datetime import date, timedelta |
|
|
|
|
| def _easter(year): |
| a, b, c = year % 19, year // 100, year % 100 |
| d, e = b // 4, b % 4 |
| f = (b + 8) // 25 |
| g = (b - f + 1) // 3 |
| h = (19 * a + b - d - g + 15) % 30 |
| i, k = c // 4, c % 4 |
| l = (32 + 2 * e + 2 * i - h - k) % 7 |
| m = (a + 11 * h + 22 * l) // 451 |
| month, day = divmod(h + l - 7 * m + 114, 31) |
| return date(year, month, day + 1) |
|
|
|
|
| def _first_monday(y, m): |
| d = date(y, m, 1) |
| return d + timedelta(days=(7 - d.weekday()) % 7) |
|
|
|
|
| def _last_monday(y, m): |
| d = date(y + (m == 12), m % 12 + 1, 1) - timedelta(days=1) |
| return d - timedelta(days=d.weekday()) |
|
|
|
|
| _cache = {} |
|
|
|
|
| def holidays(year): |
| if year in _cache: |
| return _cache[year] |
| out = set() |
| ny = date(year, 1, 1) |
| out.add(ny if ny.weekday() < 5 else ny + timedelta(days=(7 - ny.weekday()))) |
| e = _easter(year) |
| out |= {e - timedelta(days=2), e + timedelta(days=1)} |
| out |= {_first_monday(year, 5), _last_monday(year, 5), _last_monday(year, 8)} |
| xmas, box = date(year, 12, 25), date(year, 12, 26) |
| if xmas.weekday() < 5: |
| out.add(xmas) |
| out.add(box if box.weekday() < 5 else date(year, 12, 28)) |
| elif xmas.weekday() == 5: |
| out |= {date(year, 12, 27), date(year, 12, 28)} |
| else: |
| out |= {date(year, 12, 26), date(year, 12, 27)} |
| _cache[year] = out |
| return out |
|
|
|
|
| def is_holiday(d): |
| return d in holidays(d.year) |
|
|
|
|
| def xmas_week(d): |
| return (d.month == 12 and d.day >= 24) or (d.month == 1 and d.day == 1) |
|
|
