From: Timur Safin via Tarantool-patches <tarantool-patches@dev.tarantool.org> To: "'Oleg Babin'" <olegrok@tarantool.org>, <v.shpilevoy@tarantool.org> Cc: <tarantool-patches@dev.tarantool.org> Subject: Re: [Tarantool-patches] [PATCH resend v2 10/11] lua, datetime: unixtime, timestamp setters in datetime.lua Date: Sat, 31 Jul 2021 12:54:19 +0300 [thread overview] Message-ID: <04bc01d785f2$08ac04f0$1a040ed0$@tarantool.org> (raw) In-Reply-To: <b99586b5-4e88-43eb-7965-8ebe78771455@tarantool.org> : From: Oleg Babin <olegrok@tarantool.org> : Subject: Re: [Tarantool-patches] [PATCH resend v2 10/11] lua, datetime: : unixtime, timestamp setters in datetime.lua : : : On 31.07.2021 02:11, Timur Safin wrote: : > Hello Oleg, : > : > : : > : : > : Unixtime and timestamp is great but they loss precision. I think it : > : should be possible : > : : > : go get timestamp with nanoseconds precision since datetime has : > : nanoseconds precision. : > : > I'm not quite get it. Do you want to have nanoseconds exported via : newindex? : > For direct assignments? It's not useful because of available .nsec field. : > Or may be you meant something else? : > : > : : > : : > : Also still it's hard how to convert timestamp to datetime value back. : > : > Timestamp is something secs.nsec, what looks complicated? I'm confused. : > Could you please elaborate? : : I expected something like. : : tarantool> clock.time64() : --- : - 1627712632369020000 : ... : : : This timestamp is in nanoseconds. It's unsigned long long value. : : I tried to do something for datetime... : : sec * 1e9 + nsec, but sec is null while nsec is not: : : ``` : : tarantool> dt.sec : --- : - null : ... : : ``` : : : timestamp + nsec works in quite strage way: : : ``` : : tarantool> dt.timestamp * (1e9 * 1ULL) + dt.nsec : --- : - 1627712485108074000 : ... : : ``` : : (I need to cast to ULL here to avoid precision lost). : : But maybe my question is not relevant. There is a way to get nanoseconds : timestamp. : : I just need to write some simple helper for my app. It's ok. There are nanoseconds / microseconds / milliseconds getters in datetime object, which operate on the original uint64_t. Do you want them to make read-write, not read-only? tarantool> T = date '1970-01-01' --- ... tarantool> T.timestamp --- - 0 ... tarantool> T.nanoseconds --- - 0 ... tarantool> T2000 = date '2000-01-01' --- ... tarantool> T.nanoseconds --- - 0 ... tarantool> T2000.timestamp --- - 946684800 ... tarantool> T2000.nanoseconds --- - 946684800000000000 ... tarantool> T2000.secs --- - 946684800 ... tarantool> ffi = require 'ffi' --- ... tarantool> ffi.typeof(T2000.nanoseconds) --- - ctype<int64_t> ... Regards, Timur
next prev parent reply other threads:[~2021-07-31 9:54 UTC|newest] Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-07-28 10:34 [Tarantool-patches] [PATCH resend v2 00/11] Initial datetime support Timur Safin via Tarantool-patches 2021-07-28 10:34 ` [Tarantool-patches] [PATCH resend v2 01/11] build: add Christian Hansen c-dt to the build Timur Safin via Tarantool-patches 2021-07-29 23:40 ` Vladislav Shpilevoy via Tarantool-patches 2021-07-31 9:22 ` Timur Safin via Tarantool-patches 2021-07-28 10:34 ` [Tarantool-patches] [PATCH resend v2 02/11] lua: built-in module datetime Timur Safin via Tarantool-patches 2021-07-29 18:55 ` Oleg Babin via Tarantool-patches 2021-07-30 19:00 ` Timur Safin via Tarantool-patches 2021-07-31 6:29 ` Oleg Babin via Tarantool-patches 2021-07-31 16:51 ` Timur Safin via Tarantool-patches 2021-07-29 23:36 ` Vladislav Shpilevoy via Tarantool-patches 2021-07-30 15:39 ` Timur Safin via Tarantool-patches 2021-08-01 17:01 ` Vladislav Shpilevoy via Tarantool-patches 2021-08-01 20:23 ` Timur Safin via Tarantool-patches 2021-08-04 23:57 ` Vladislav Shpilevoy via Tarantool-patches 2021-07-28 10:34 ` [Tarantool-patches] [PATCH resend v2 03/11] lua, datetime: datetime tests Timur Safin via Tarantool-patches 2021-07-29 18:55 ` Oleg Babin via Tarantool-patches 2021-07-30 20:45 ` Timur Safin via Tarantool-patches 2021-07-28 10:34 ` [Tarantool-patches] [PATCH resend v2 04/11] lua, datetime: display datetime Timur Safin via Tarantool-patches 2021-07-29 18:55 ` Oleg Babin via Tarantool-patches 2021-07-30 21:48 ` Timur Safin via Tarantool-patches 2021-07-31 6:29 ` Oleg Babin via Tarantool-patches 2021-07-28 10:34 ` [Tarantool-patches] [PATCH resend v2 05/11] box, datetime: add messagepack support for datetime Timur Safin via Tarantool-patches 2021-07-28 10:34 ` [Tarantool-patches] [PATCH resend v2 06/11] box, datetime: datetime comparison for indices Timur Safin via Tarantool-patches 2021-07-29 18:56 ` Oleg Babin via Tarantool-patches 2021-07-30 22:18 ` Timur Safin via Tarantool-patches 2021-07-31 6:30 ` Oleg Babin via Tarantool-patches 2021-07-31 9:31 ` Timur Safin via Tarantool-patches 2021-07-28 10:34 ` [Tarantool-patches] [PATCH resend v2 07/11] lua, datetime: proper datetime encoding Timur Safin via Tarantool-patches 2021-07-29 18:57 ` Oleg Babin via Tarantool-patches 2021-07-30 22:20 ` Timur Safin via Tarantool-patches 2021-07-28 10:34 ` [Tarantool-patches] [PATCH resend v2 08/11] lua, datetime: calculated attributes for datetimes Timur Safin via Tarantool-patches 2021-07-29 18:57 ` Oleg Babin via Tarantool-patches 2021-07-30 22:30 ` Timur Safin via Tarantool-patches 2021-07-31 6:31 ` Oleg Babin via Tarantool-patches 2021-07-28 10:34 ` [Tarantool-patches] [PATCH resend v2 09/11] lua, datetime: time intervals support Timur Safin via Tarantool-patches 2021-07-29 18:58 ` Oleg Babin via Tarantool-patches 2021-07-30 22:58 ` Timur Safin via Tarantool-patches 2021-07-31 6:31 ` Oleg Babin via Tarantool-patches 2021-07-31 9:20 ` Timur Safin via Tarantool-patches 2021-07-28 10:34 ` [Tarantool-patches] [PATCH resend v2 10/11] lua, datetime: unixtime, timestamp setters in datetime.lua Timur Safin via Tarantool-patches 2021-07-29 18:58 ` Oleg Babin via Tarantool-patches 2021-07-30 23:11 ` Timur Safin via Tarantool-patches 2021-07-31 6:31 ` Oleg Babin via Tarantool-patches 2021-07-31 9:54 ` Timur Safin via Tarantool-patches [this message] 2021-07-28 10:34 ` [Tarantool-patches] [PATCH resend v2 11/11] datetime: changelog for datetime module Timur Safin via Tarantool-patches 2021-07-29 18:55 ` [Tarantool-patches] [PATCH resend v2 00/11] Initial datetime support Oleg Babin via Tarantool-patches
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