Epoch time calc9/1/2023 ![]() ![]() Later versions of Android bundle implementations of the java.time classes.Most of the java.time functionality is back-ported to Java 6 & 7 in ThreeTen-Backport.Java 9 adds some minor features and fixes.Java SE 8, Java SE 9, Java SE 10, Java SE 11, and later - Part of the standard Java API with a bundled implementation.No need for strings, no need for java.sql.* classes. Use a JDBC driver compliant with JDBC 4.2 or later. You may exchange java.time objects directly with your database. And search Stack Overflow for many examples and explanations. The Joda-Time project, now in maintenance mode, advises migration to the java.time classes. These classes supplant the troublesome old legacy date-time classes such as, Calendar, & SimpleDateFormat. The java.time framework is built into Java 8 and later. For other formats, search Stack Overflow to learn about DateTimeFormatter. To get a String representing this date-time value, call Instant::toString. Instant instant = Instant.ofEpochSecond( mnSeconds, mnNanoseconds ) Or pass both numbers to the of, as two arguments. Instant instant = Instant.ofEpochSecond( mnSeconds ).plusNanos( mnNanoseconds ) The Instant class represents a moment on the timeline in UTC with a resolution up to nanoseconds. The Joda-Time team also advises migration to java.time. These classes supplant the old troublesome date-time classes such as. replace "Z", "" ) // Remove the `Z` on the end (indicating UTC). replace( "T", " " ) // Replace the `T` in the middle with a SPACE. toString() // Generate text representing this `Instant` object in standard ISO 8601 format. Returns another `Instant` object, per Immutable Objects pattern. plusNanos( mnNanoseconds ) // Add on a fractional second as a count of nanoseconds. ofEpochSecond( mnSeconds ) // Determine a moment from a count of whole seconds since the Unix epoch of the first moment of 1970 in UTC (T00:00Z). But (365*4+1) may benefit with something like "DaysPer4Years".Tl dr Instant // Represent a moment in UTC. Most of the magic numbers like 60, 24 are so well-known that constant or macro substitution seems superfluous. Code then looks more complicated, but is faster. There exist equation based (non-loop) solutions to the year-day that do not need a table like your unsigned short days. Unsigned int date_time_to_epoch(const date_time_t* date_time) There are pros and cons to this, but may be beneficial in your case: // unsigned int date_time_to_epoch(date_time_t* date_time) Use a long for your epoch as in: void epoch_to_date_time(date_time_t* date_time,unsigned long epoch)Īs unsigned is only guaranteed to range form 0 to at least 65535 which is insufficient here.įor various functions, consider adding const. Various elements of this function break without those givens. So OP knows of code limitations concerning these. Good that OP is using 4 simplifications: year 2000-2099, no DST, no leap second, no timezone. Any constructive comments would be appreciated (performance improvement suggestions, readability, etc). I have tested this on an extensive amount of legal input (between and ). Void epoch_to_date_time(date_time_t* date_time,unsigned int epoch)ĭate_time->second = epoch%60 epoch /= 60 ĭate_time->minute = epoch%60 epoch /= 60 Unsigned int year = date_time->year // 0-99 Unsigned int month = date_time->month-1 // 0-11 Unsigned int day = date_time->day-1 // 0-30 Unsigned int hour = date_time->hour // 0-23 Unsigned int minute = date_time->minute // 0-59 Unsigned int second = date_time->second // 0-59 Unsigned int date_time_to_epoch(date_time_t* date_time) I would like to have a second opinion on the following conversion routines (given a legal input): static unsigned short days = I have the following date/time structure: typedef struct I am trying to implement two simple convertors: date/time to time-stamp and vice-versa, without any dependencies on time library routines (such as localtime, mktime, etc, mainly due to the fact that some of them are not thread-safe). ![]()
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