Time and Timethe time
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Further information can be found in the CPython documentation: time.... User Interface provides features to retrieve the actual time and date, measure time interval and delay. Period: The Unix interface uses the default for the era of point-of-sale computers from 01.01.1970 00:00:00:00 GMT. Implemented interfaces use the era 2000-01-01 00:00:00:00:00 GMT.
Maintenance of the present date/time calendar: An RTC (Real Time Clock) is required. However, with bare metal ports, the system time is dependent on the type of machinery. It is possible to adjust the present date time with the RTC (). datetime(tuple) command and update it using the following methods: Use of the time network log (requires configuration by a port/user). Manual adjusted by a single operator at each power-up (many board will keep the RTC time via hardware reset, although some may need to be adjusted again in this case).
Converts a time, in seconds since the epoch (see above), into an 8-tuple that contains: Year, monthly, day, hour, minutes, seconds, weekdays, years) If seconds is not specified or none, the actual time from the RTC is used. Year contains the 20th anniversary (e.g. 2014). It is the reverse of the local time feature.
He argues for a complete 8-tuple that represents a time according to local time. A whole number is returned, which is the number of seconds since January 1, 2000. Notice that other board may not support a floating-point reason, use the sleep_ms() and sleep_us() function for reasons of interoperability. Deceleration for a specified number of miliseconds, should be either zero or zero. Deceleration for a specified number of miliseconds, should be either zero or zero or zero. Provides a rising milisecond count with any given point of measurement that surrounds itself after a specified value.
Timeframe of the value is INTERIM OF SERIOD = TICKS_MAX + 1. Use the same periodic value for all ticks_ms (), ticks_us(), ticks_cpu() function (for simplification). Therefore, these function provide a value in the area[ 0 ... TICKS_MAX], including all possible TPERIODs. Please be aware that only non-negative data is used. In most cases, you should consider the value returning from these features as non-transparent.
Only the ticks_diff () and ticks_add() function described below are available for them. Conducting maths operation and subsequently handing over their results as argument to ticks_diff() or ticks_add() also leads to void results of the latter function. Exactly like ticks_ms() above, but in micseconds. Like ticks_ms () and ticks_us(), but with the highest possible system resolutions.
These are usually PLC clock generators, and therefore the feature is called this way. However, the precise time units (resolution) of this feature are not specified at the runtime engine layer, but the information for a particular portal may give more detailed information. These functions are designed for very subtle benchmarks or very narrow real-time looping.
Some ports do not implement this feature. . : : :, Mesure la différence entre les valeurs renvoyées par les fonctions ticks_ms(), ticks_us(), ou ticks_cpu(), comme une valeur signée qui peut s'enrouler autour. Sequence of arguments is the same as for Subtract operators, tricks_diff (ticks1, ticks2) has the same meanings as tricks1 - thicks2.
You can bypass the ticks_ms (), etc. function's return value, however, so using them directly with substractions will cause the wrong results. Therefore ticks_diff() is needed, it implement modulare (or more precisely, ring) arithmetic to provide a proper outcome even for wrap-around value (unless they are too far apart, see below).
Displays a sign value in the area [ -TICKS_PERIOD/2 ... TICKS_PERIOD/2-1] (this is a type of area specification for two' complementary characters). This means that if the results are positive, it means that Tick1 appeared before Tick2. Otherwise this means that kicks1 appeared after kicks2. That only applies if picks1 and picks2 are not separated for more than TICKS_PERIOD/2-1 picks.
Otherwise, an erroneous outcome is reported. Especially if two ticket numbers for TICKS_PERIOD/2-1 tickets are separated, this value is given back by the command. If, however, TICKS_PERIOD/2 of realtime tricks happened between them, the command returns -TICKS_PERIOD/2 instead, i.e. the resulting value is switched to the minus value area.
Let's say you're trapped in a room where there's no way to watch the time, except for a regular 12-star time. "Exactly at the right time! Hint: Do not give time() value to ticks_diff(), you should apply regular arithmetic to it. However, keep in mind that time() can (and will) also overwrite.
Provides the number of seconds as an integral number since the epoch, under the assumption that the RTC on which it is based is adjusted and updated as described above. When no RTC is selected, this feature will return the number of seconds since a portspecific datum (for board without RTC, usually since power-on or reset).
When you need a higher accuracy, use the ticks_ms () and ticks_us() commands, if you need calender time, localtime() without arguments is a better use. CPython uses this feature to return the number of seconds since the Unix era, 01.01.1970 00:00 GMT, as a decimal point, usually with accuracy of microseconds. Normally, Embedded hard ware has no floating point accuracy to display both long time periods and an accuracy of less than one second, so it uses integers with second accuracy.
Also, some nested pieces of equipment do not have a battery-powered RTC, so the number of seconds since the last power-up or from another relatively hardware-specific point (e.g., reset) is returned.