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1 file changed, 206 insertions
date_utils.py(archivo creado)
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| 1 | + | import calendar # 匯入 calendar 模組 | |
| 2 | + | import math | |
| 3 | + | from datetime import date, datetime, time | |
| 4 | + | ||
| 5 | + | import pytz | |
| 6 | + | from dateutil.relativedelta import relativedelta | |
| 7 | + | ||
| 8 | + | ||
| 9 | + | def date_type(value): | |
| 10 | + | return (datetime if isinstance(value, datetime) else date) # 根據值的類型返回 datetime 或 date # fmt: skip | |
| 11 | + | ||
| 12 | + | ||
| 13 | + | def get_month(date): | |
| 14 | + | date_from = date_type(date)(date.year, date.month, 1) # 建立日期起始值為當月第一天 | |
| 15 | + | date_to = date_type(date)(date.year, date.month, calendar.monthrange(date.year, date.month)[1]) # 建立日期結束值為當月最後一天 # fmt: skip | |
| 16 | + | return date_from, date_to # 返回起始日期和結束日期 | |
| 17 | + | ||
| 18 | + | ||
| 19 | + | def get_quarter_number(date): | |
| 20 | + | return math.ceil(date.month / 3) # 回傳日期對應的季度數字，向上取整 | |
| 21 | + | ||
| 22 | + | ||
| 23 | + | def get_quarter(date): | |
| 24 | + | quarter_number = get_quarter_number(date) # 獲取日期對應的季度數字 | |
| 25 | + | month_from = ((quarter_number - 1) * 3) + 1 # 計算季度的起始月份 | |
| 26 | + | date_from = date_type(date)(date.year, month_from, 1) # 建立季度的起始日期 | |
| 27 | + | date_to = date_from + relativedelta(months=2) # 結束日期為起始日期加兩個月 | |
| 28 | + | date_to = date_to.replace( | |
| 29 | + | day=calendar.monthrange(date_to.year, date_to.month)[1] | |
| 30 | + | ) # 調整結束日期為該月的最後一天 | |
| 31 | + | return date_from, date_to # 返回季度的起始日期和結束日期 | |
| 32 | + | ||
| 33 | + | ||
| 34 | + | def get_timedelta(qty, granularity): | |
| 35 | + | switch = { | |
| 36 | + | "hour": relativedelta(hours=qty), | |
| 37 | + | "day": relativedelta(days=qty), | |
| 38 | + | "week": relativedelta(weeks=qty), | |
| 39 | + | "month": relativedelta(months=qty), | |
| 40 | + | "year": relativedelta(years=qty), | |
| 41 | + | } | |
| 42 | + | return switch[granularity] | |
| 43 | + | ||
| 44 | + | ||
| 45 | + | def start_of(value, granularity): | |
| 46 | + | is_datetime = isinstance(value, datetime) | |
| 47 | + | if granularity == "year": | |
| 48 | + | result = value.replace(month=1, day=1) | |
| 49 | + | elif granularity == "quarter": | |
| 50 | + | # Q1 = Jan 1st | |
| 51 | + | # Q2 = Apr 1st | |
| 52 | + | # Q3 = Jul 1st | |
| 53 | + | # Q4 = Oct 1st | |
| 54 | + | result = get_quarter(value)[0] | |
| 55 | + | elif granularity == "month": | |
| 56 | + | result = value.replace(day=1) | |
| 57 | + | elif granularity == "week": | |
| 58 | + | # by default MONDAY is the first day of the week and SUNDAY is the last. | |
| 59 | + | result = value - relativedelta( | |
| 60 | + | days=calendar.weekday(value.year, value.month, value.day) | |
| 61 | + | ) | |
| 62 | + | elif granularity == "day": | |
| 63 | + | result = value | |
| 64 | + | elif granularity == "hour" and is_datetime: | |
| 65 | + | return datetime.combine(value, time.min).replace(hour=value.hour) | |
| 66 | + | elif is_datetime: | |
| 67 | + | raise ValueError("Granularity must be year, quarter, month, week, day or hour for value %s" % value) # fmt: skip | |
| 68 | + | # raise ValueError("請設定精確度為年、季、月、週、日或小時，目前設定值為 %s" % value) | |
| 69 | + | ||
| 70 | + | else: | |
| 71 | + | raise ValueError("Granularity must be year, quarter, month, week or day for value %s" % value) # fmt: skip | |
| 72 | + | # raise ValueError("精確度應為年、季、月、週或日，但收到的值為 %s" % value) | |
| 73 | + | ||
| 74 | + | return datetime.combine(result, time.min) if is_datetime else result | |
| 75 | + | ||
| 76 | + | ||
| 77 | + | def end_of(value, granularity): | |
| 78 | + | is_datetime = isinstance(value, datetime) | |
| 79 | + | if granularity == "year": | |
| 80 | + | result = value.replace(month=12, day=31) | |
| 81 | + | elif granularity == "quarter": | |
| 82 | + | # Q1 = Mar 31st | |
| 83 | + | # Q2 = Jun 30th | |
| 84 | + | # Q3 = Sep 30th | |
| 85 | + | # Q4 = Dec 31st | |
| 86 | + | result = get_quarter(value)[1] | |
| 87 | + | elif granularity == "month": | |
| 88 | + | result = value + relativedelta(day=1, months=1, days=-1) | |
| 89 | + | elif granularity == "week": | |
| 90 | + | result = value + relativedelta(days=6 - calendar.weekday(value.year, value.month, value.day)) # fmt: skip | |
| 91 | + | ||
| 92 | + | elif granularity == "day": | |
| 93 | + | result = value | |
| 94 | + | elif granularity == "hour" and is_datetime: | |
| 95 | + | return datetime.combine(value, time.max).replace(hour=value.hour) | |
| 96 | + | elif is_datetime: | |
| 97 | + | raise ValueError("Granularity must be year, quarter, month, week, day or hour for value %s" % value) # fmt: skip | |
| 98 | + | # raise ValueError("請設定精確度為年、季、月、週、日或小時，目前設定值為 %s" % value) | |
| 99 | + | else: | |
| 100 | + | raise ValueError("Granularity must be year, quarter, month, week or day for value %s" % value) # fmt: skip | |
| 101 | + | # raise ValueError("精確度應為年、季、月、週或日，但收到的值為 %s" % value) | |
| 102 | + | ||
| 103 | + | return datetime.combine(result, time.max) if is_datetime else result | |
| 104 | + | ||
| 105 | + | ||
| 106 | + | def add(value, *args, **kwargs): | |
| 107 | + | return value + relativedelta(*args, **kwargs) # 將 value 增加指定的相對時間 | |
| 108 | + | ||
| 109 | + | ||
| 110 | + | def subtract(value, *args, **kwargs): | |
| 111 | + | return value - relativedelta(*args, **kwargs) # 將 value 減去指定的相對時間 | |
| 112 | + | ||
| 113 | + | ||
| 114 | + | def date_range(start, end, step=relativedelta(months=1)): | |
| 115 | + | if isinstance(start, datetime) and isinstance(end, datetime): | |
| 116 | + | are_naive = start.tzinfo is None and end.tzinfo is None | |
| 117 | + | are_utc = start.tzinfo == pytz.utc and end.tzinfo == pytz.utc | |
| 118 | + | ||
| 119 | + | # Cases with miscellaneous time zones are more complex due to DST. | |
| 120 | + | are_others = start.tzinfo and end.tzinfo and not are_utc | |
| 121 | + | ||
| 122 | + | if are_others and start.tzinfo.zone != end.tzinfo.zone: | |
| 123 | + | raise ValueError("Timezones of start argument and end argument seem inconsistent") # fmt: skip | |
| 124 | + | ||
| 125 | + | if not are_naive and not are_utc and not are_others: | |
| 126 | + | raise ValueError("Timezones of start argument and end argument mismatch") | |
| 127 | + | ||
| 128 | + | dt = start.replace(tzinfo=None) | |
| 129 | + | end_dt = end.replace(tzinfo=None) | |
| 130 | + | post_process = start.tzinfo.localize if start.tzinfo else lambda dt: dt | |
| 131 | + | ||
| 132 | + | elif isinstance(start, date) and isinstance(end, date): | |
| 133 | + | dt, end_dt = start, end | |
| 134 | + | post_process = lambda dt: dt | |
| 135 | + | ||
| 136 | + | else: | |
| 137 | + | raise ValueError("start/end should be both date or both datetime type") | |
| 138 | + | ||
| 139 | + | if start > end: | |
| 140 | + | raise ValueError("start > end, start date must be before end") | |
| 141 | + | ||
| 142 | + | if start == start + step: | |
| 143 | + | raise ValueError("Looks like step is null") | |
| 144 | + | ||
| 145 | + | while dt <= end_dt: | |
| 146 | + | yield post_process(dt) | |
| 147 | + | dt = dt + step | |
| 148 | + | ||
| 149 | + | ||
| 150 | + | # 檢查當前程式是否被作為主程式執行 | |
| 151 | + | if __name__ == "__main__": | |
| 152 | + | # 建立一個日期物件 | |
| 153 | + | input_date = date(2023, 12, 15) | |
| 154 | + | ||
| 155 | + | # 使用 get_month 函數獲取該日期所在月份的起始日期和結束日期 | |
| 156 | + | month_start_date, month_end_date = get_month(input_date) | |
| 157 | + | ||
| 158 | + | # 輸出結果 | |
| 159 | + | print("Month Start Date:", month_start_date) | |
| 160 | + | print("Month End Date:", month_end_date) | |
| 161 | + | ||
| 162 | + | # 使用 get_quarter_number 函數獲取該日期對應的季度數字 | |
| 163 | + | quarter_num = get_quarter_number(input_date) | |
| 164 | + | ||
| 165 | + | # 使用 get_quarter 函數獲取該日期所在季度的起始日期和結束日期 | |
| 166 | + | quarter_start_date, quarter_end_date = get_quarter(input_date) | |
| 167 | + | ||
| 168 | + | # 輸出結果 | |
| 169 | + | print("Quarter Number:", quarter_num) | |
| 170 | + | print("Quarter Start Date:", quarter_start_date) | |
| 171 | + | print("Quarter End Date:", quarter_end_date) | |
| 172 | + | ||
| 173 | + | # 呼叫 get_timedelta 函數，設定數量為 2，時間間隔為 'month' | |
| 174 | + | time_delta = get_timedelta(2, "month") | |
| 175 | + | ||
| 176 | + | # 輸出結果 | |
| 177 | + | print("Time Delta:", time_delta) | |
| 178 | + | ||
| 179 | + | input_datetime = datetime(2024, 3, 22, 15, 30, 0) | |
| 180 | + | ||
| 181 | + | # 使用 start_of 函數獲取以週為精確度的日期起始時間 | |
| 182 | + | start_of_week = start_of(input_datetime, "week") | |
| 183 | + | print("Start of Week:", start_of_week) | |
| 184 | + | ||
| 185 | + | # 使用 end_of 函數獲取以週為精確度的日期結束時間 | |
| 186 | + | end_of_week = end_of(input_datetime, "week") | |
| 187 | + | print("End of Week:", end_of_week) | |
| 188 | + | ||
| 189 | + | # 呼叫 add 函數，將 value 增加 2 個月 | |
| 190 | + | result_add = add(datetime.now(), months=2) | |
| 191 | + | ||
| 192 | + | print("Result of add function:", result_add) | |
| 193 | + | ||
| 194 | + | # 呼叫 subtract 函數，將 value 減去 1 年 | |
| 195 | + | result_subtract = subtract(datetime.now(), years=1) | |
| 196 | + | ||
| 197 | + | print("Result of subtract function:", result_subtract) | |
| 198 | + | ||
| 199 | + | # 定義起始日期和結束日期 | |
| 200 | + | start_date = datetime(2024, 1, 1) | |
| 201 | + | end_date = datetime(2024, 3, 1) | |
| 202 | + | ||
| 203 | + | # 呼叫date_range函數並迭代生成的日期序列 | |
| 204 | + | for date in date_range(start_date, end_date, step=relativedelta(months=1)): | |
| 205 | + | print(date) | |
| 206 | + | ||
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