time

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import datetime
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import time
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time.gmtime()    # UTC 时间
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time.localtime() # 本机时间；反函数 mktime
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# 返回 time.struct_time(tm_year=2021, tm_mon=10, tm_mday=11, tm_hour=19, tm_min=21, tm_sec=42, tm_wday=0, tm_yday=284, tm_isdst=0)
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datetime.utcnow() # UTC 时间
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datetime.datetime.now()
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datetime.datetime.today()
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# 返回：datetime.datetime(2021, 10, 1, 12, 42, 42, 861603)

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from datetime import datetime, timedelta
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local_time = datetime.now()
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# 返回 datetime.datetime(2022, 1, 19, 0, 47, 51, 466384)
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hours_ago = local_time - timedelta(hours=8)
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# 返回 datetime.datetime(2022, 1, 18, 16, 43, 25, 870600
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timestamp = datetime.timestamp(hours_ago)
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# 返回 1642495405.8706
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# 转换为时间戳
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# 秒
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s = str(timestamp)[:10] # '1642495405'
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s = hours_ago.strftime('%s') # '1642495405'
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# 毫秒
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ms = int(timestamp * 1000) # 1642495405870

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impot time
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local_time = time.time()  # 1642594551.111939
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s = round(local_time) # 10位
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ms = str(local_time * 1000)[:13] # 13位
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# 计算
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hours_ago = local_time - 3600 * 8
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ago_s = round(hours_ago)