34 lines
903 B
C
34 lines
903 B
C
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#pragma once
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#include <Arduino.h>
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#include <time.h>
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// Returns true if the system clock has been set to a plausible time (year >= 2020).
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inline bool hasValidTime() {
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time_t now = time(nullptr);
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struct tm t;
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gmtime_r(&now, &t);
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return (t.tm_year + 1900) >= 2020;
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}
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// Returns the current UTC time as an ISO 8601 string (e.g., "2026-08-04T17:30:00.000Z").
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inline String isoNow() {
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time_t now = time(nullptr);
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struct tm t;
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gmtime_r(&now, &t);
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char buf[32];
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strftime(buf, sizeof(buf), "%Y-%m-%dT%H:%M:%S.000Z", &t);
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return String(buf);
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}
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// Returns (now - 30 days) as an ISO 8601 UTC string.
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inline String isoNowMinus30d() {
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time_t now = time(nullptr);
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now -= 30 * 24 * 3600; // Subtract 30 days in seconds
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struct tm t;
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gmtime_r(&now, &t);
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char buf[32];
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strftime(buf, sizeof(buf), "%Y-%m-%dT%H:%M:%S.000Z", &t);
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return String(buf);
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}
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