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|Language |C std lib POSIX |Boost::datetime |QDateTime |Java.util (deprecated), |Javascript |Python datetime |

| | | |QtCore |JDK8 javax.time.* | |pytz |

|immutable Classes |Clock_t () |tzinfo, |QDate QTime |Instant(ns >=int64_t) UTCInstant |Should be, but net yet|3rd party module: |

| |uptime |ptime(datetime), | |(unix_time) | |Datetime |

| |time_t: (long type) | |Delta? |Duration(ns) (delta) | | |

| |seconds since UNIX epoch: | | |LocalDateTime, ZoneId | | |

| |1970-01-01Z | | |Period(date range ) | | |

|Mutable classes |struct tm * shared |Gregorian::date, local_time, | QDateTime |Date (deprecated), |Date |Date, time |

| |gmtime(time_t* );     |poxis_time time_duration/period | |Calendar (old API) |(=DateTime) |datetime |

| |localtime(time_t *); |,iterator | | |Date.set*() |tzinfo |

| | | | | | |timedelta |

|Min-max |1970-01-01 to |Gregorian calendar |Julian Calendar |ISO calendar system, |+/-100,000,000 days |datetime.min= |

|range |Year 2038 (int32_t), |from year 1 |JulianDays() |-999999999-01-01 |relative to EPOCH |Year 1 |

| |no hassle to 64bit OS | | | | |Year 9999 |

|Resolution |TICKS_PER_SECOND  clock() |Depends on building: millis, nanos|? |Millisecond ( ................
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