unix-timestamp

I have a string like 2013-05-29T21:19:48Z . I'd like to convert it to the number of seconds since 1 January 1970 (the UNIX epoch), so that I can save it using just 4 bytes (or maybe 5 bytes, to avoid the year 2038 problem). How can I do that in a portable way? (My code has to run both on Linux and Windows.) I can get the date parts out of the string, but I don't know how to figure out the number of seconds. I tried looking at the documentation of date and time utilities in C++ , but I didn't find anything. use std::get_time if you want the c++ way - but both other options are also valid.

Assuming you have a Unix timestamp, what would be an easy and/or elegant way to check if that timestamp was some time yesterday? I am mostly looking for solutions in Javascript, PHP or C#, but pseudo code and language agnostic solutions (if any) are welcome as well. PHP: $isYesterday = date('Ymd', $timestamp) == date('Ymd', strtotime('yesterday')); In C# you could use this: bool isYesterday = DateTime.Today - time.Date == TimeSpan.FromDays(1); In pseudo code, to compare timestamps: get current Unix timestamp transform the retrieved timestamp to a date subtract 1 day from the date transform the

I learned that one can transform a unix time stamp into a date by using date filter from this post: AngularJS. Convert tag value (Unix time to human-readable time) But I can not convert mine with it... <td>{{contract.start_date_unix | date:'MM-dd-yyyy'}}</td> inside the contract.start_date_unix , its valued at 1406779200 I checked it with a checker that it shows exactly what I want: Thu, 31 Jul 2014 04:00:00 GMT (but of course, the format I want is MM-dd-yyyy, the date is correct and that's what I try to prove here) But when I do the date filter above, it will only show 01-17-1970 or 01-16

I'm trying to store in timestamp with timezone field my value. It is in milliseconds from 1970. select TO_CHAR(TO_TIMESTAMP(1401432881230), 'DD/MM/YYYY HH24:MI:SS.MS') Expected 30/5/2014 11:29:42 10:54:41.230 , but get 22/08/46379 23:27:02.000 Unix timestamps measures time with seconds, and not milliseconds ( almost everywhere, in PostgreSQL too). Therefore you need to call SELECT TO_TIMESTAMP(1401432881230 / 1000); If you want to preserve milliseconds, call with double precision : SELECT TO_TIMESTAMP(1401432881230::double precision / 1000); This is how I convert ms to timestamp and keep ms

We have a database with all the dates and times stored in one column called timestamp. The format of the date/time in the column "timestamp" is as: 03 Aug 08:10am. I would like to convert this (03 Aug 08:10am) to UNIX TIMESTAMP in MySQL and not PHP because we already have over 500 rows with this format: 03 Aug 08:10am. I tried create a new INT column called new_timestamp and ran this query: UPDATE table_name SET new_timestamp = UNIX_TIMESTAMP(timestamp); However, it shows that 0 rows were affected. This is not a duplicate, don't redirect me to how to convert in PHP. Read the question first :)

This seems like something no one should ever have to do, but I'm working on a kernel module for an embedded system (OpenWRT) in which it seems that time.h does include the timespec and time_t types, and the clock_gettime and gmtime functions, but does not include localtime , ctime , time , or, critically, the tm type. When I attempt to cast the return pointer from gmtime to my own struct, I get a segfault. So I guess I'd be content to solve the problem either of two ways—it'd be great to figure out how to get access to that missing type, or alternatively, how to roll my own method for

I'm looking for the best practice/solution to book a service internationally, using same time in any browser. I don't quite get the logic (and dug around here too). Use case user in Brussels booking lets say a haircut service based in Singapore - he is flying there in a week. He picks 14:00 in the browser datetime control. The browser is, however, set to +1 UTC. SG haircut stylist should see the time in his agenda as 14:00 SG time. the barber shop owner is traveling at Dubai, and he wants to see his agenda still in SG timezone, despite his browser is temporarily set to +4 UTC. Basically, all