26 lines
780 B
Python
26 lines
780 B
Python
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# services/time_utils.py
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"""
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时间辅助函数。
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刻意不依赖 flask / db / models，避免被 services.db_ingest 和 routes.api
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互相引用时产生循环导入。
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"""
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from datetime import datetime
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def calculate_offset(latest_time_str):
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"""
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计算时间滞后天数
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用于前端展示设备数据是否过时
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"""
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if not latest_time_str or latest_time_str == "N/A":
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return "从未同步"
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try:
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# 兼容处理 2026_01_13 和 2026-01-13 格式
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clean = str(latest_time_str).split()[0].replace('_', '-')
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target = datetime.strptime(clean, "%Y-%m-%d").date()
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diff = (datetime.now().date() - target).days
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return "当天" if diff == 0 else f"滞后 {diff} 天"
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except:
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return "时间解析失败"
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