CBL-7773: Remove date.h and use std::chrono

Author: jianminzhao

CMakeLists.txt

@@ -40,7 +40,7 @@ Platform logic is largely separated into the cmake/platform_*.cmake files.  Plat
 cmake_minimum_required (VERSION 3.21...4.0)
 
 # Mac/apple setup -- must appear before the first "project()" line"
-set(CMAKE_OSX_DEPLOYMENT_TARGET "13.0")
+set(CMAKE_OSX_DEPLOYMENT_TARGET "13.3")
 if(NOT DEFINED CMAKE_OSX_SYSROOT)
     # Tells Mac builds to use the current SDK's headers & libs, not what's in the OS.
     set(CMAKE_OSX_SYSROOT macosx)

Crypto/Certificate.cc

@@ -37,7 +37,6 @@
 #include <algorithm>
 #include <cstdlib>
 #include <chrono>
-#include "date/date.h"
 
 namespace litecore::crypto {
     using namespace std;
@@ -262,8 +261,8 @@ namespace litecore::crypto {
         auto         now = floor<seconds>(system_clock::now()) - 60s;
         auto         exp = now + seconds(issuerParams.validity_secs);
         stringstream notBefore, notAfter;
-        notBefore << date::format("%Y%m%d%H%M%S", now);
-        notAfter << date::format("%Y%m%d%H%M%S", exp);
+        notBefore << std::format("{:%Y%m%d%H%M%S}", now);
+        notAfter << std::format("{:%Y%m%d%H%M%S}", exp);
 
         // Set certificate attributes:
         mbedtls_x509write_crt_set_subject_key(&crt, subjectKey->context());
@@ -345,8 +344,8 @@ namespace litecore::crypto {
     }
 
     static time_t x509_to_time_t(const mbedtls_x509_time& xtime) {
-        date::sys_days    date     = date::year{xtime.year} / xtime.mon / xtime.day;
-        date::sys_seconds datetime = date + (hours(xtime.hour) + minutes(xtime.min) + seconds(xtime.sec));
+        sys_days    date     = year{xtime.year} / xtime.mon / xtime.day;
+        sys_seconds datetime = date + (hours(xtime.hour) + minutes(xtime.min) + seconds(xtime.sec));
 
         // The limit of 32-bit time_t is approaching...
         auto result = datetime.time_since_epoch().count();

LiteCore/Logging/LogDecoder.cc

@@ -18,7 +18,6 @@
 #include <cstring>
 #include <chrono>
 #include <algorithm>
-#include "date/date.h"
 #include "ParseDate.hh"
 #include "NumConversion.hh"
 
@@ -51,27 +50,29 @@ namespace litecore {
     }
 
     void LogIterator::writeTimestamp(Timestamp t, ostream& out, bool inUtcTime) {
-        date::local_time<microseconds> tp{seconds(t.secs) + microseconds(t.microsecs)};
-        const char*                    fmt = "%FT%TZ ";
-        if ( !inUtcTime ) {
-            struct tm tmpTime = FromTimestamp(duration_cast<seconds>(tp.time_since_epoch()));
+        if ( inUtcTime ) {
+            writeISO8601DateTime(t, out);
+            out << " ";
+        } else {
+            local_time<microseconds> tp{seconds(t.secs) + microseconds(t.microsecs)};
+            struct tm                tmpTime = FromTimestamp(duration_cast<seconds>(tp.time_since_epoch()));
+            // Updates tp to the local time.
             tp += GetLocalTZOffset(&tmpTime, true);
-            fmt = "%FT%T ";
+            out << std::format("{:%FT%T }", tp);
         }
-        out << date::format(fmt, tp);
     }
 
     void LogIterator::writeISO8601DateTime(Timestamp t, std::ostream& out) {
-        date::sys_time<microseconds> tp(seconds(t.secs) + microseconds(t.microsecs));
-        out << date::format("%FT%TZ", tp);
+        sys_time<microseconds> tp(seconds(t.secs) + microseconds(t.microsecs));
+        out << std::format("{:%FT%TZ}", tp);
     }
 
     string LogIterator::formatDate(Timestamp t) {
-        date::local_time<microseconds> tp(seconds(t.secs) + microseconds(t.microsecs));
-        struct tm                      tmpTime = FromTimestamp(duration_cast<seconds>(tp.time_since_epoch()));
+        local_time<microseconds> tp(seconds(t.secs) + microseconds(t.microsecs));
+        struct tm                tmpTime = FromTimestamp(duration_cast<seconds>(tp.time_since_epoch()));
         tp += GetLocalTZOffset(&tmpTime, true);
         stringstream out;
-        out << date::format("%c", tp);
+        out << std::format("%c", tp);
         return out.str();
     }
 
@@ -148,8 +149,8 @@ namespace litecore {
                               std::optional<Timestamp> startingAt) {
         if ( !startingAt || *startingAt < Timestamp{_startTime, 0} ) {
             writeTimestamp({_startTime, 0}, out, true);
-            date::local_time<seconds> tp{seconds(_startTime)};
-            out << "---- Logging begins on " << date::format("%A %FT%TZ", tp) << " ----" << endl;
+            local_time<seconds> tp{seconds(_startTime)};
+            out << "---- Logging begins on " << std::format("{:%A %FT%TZ}", tp) << " ----" << endl;
         }
 
         LogIterator::decodeTo(out, levelNames, startingAt);

LiteCore/Query/DateFormat.cc

@@ -1,6 +1,5 @@
 #include "DateFormat.hh"
 #include "ParseDate.hh"
-#include "date/date.h"
 #include "fleece/slice.hh"
 #include <optional>
 #include <slice_stream.hh>
@@ -19,8 +18,7 @@ namespace fleece {
 
     const DateFormat DateFormat::kISO8601 = DateFormat{YMD::kISO8601, Separator::T, HMS::kISO8601, {Timezone::NoColon}};
 
-    /** This parses a subset of the formatting tokens from "date.h", found 
-     * here: https://howardhinnant.github.io/date/date.html#to_stream_formatting.
+    /** This parses a subset of the formatting tokens of std::format
      * The valid tokens are:
      * %Y: Year (YYYY), %m: Month (MM), %d: Day (DD).
      * %F == %Y-%m-%d
@@ -326,31 +324,31 @@ namespace fleece {
         std::ostringstream stream;
 
         const milliseconds millis{milliseconds{timestamp} + duration_cast<milliseconds>(tzoffset)};
-        const auto         tm = date::local_time<milliseconds>{millis};
-
-        const seconds offset_seconds{tzoffset};
+        const auto         tm = local_time<milliseconds>{millis};
 
         const DateFormat f = fmt.has_value() ? fmt.value() : kISO8601;
 
-        if ( f.ymd.has_value() ) { stream << date::format("%F", tm); }
+        if ( f.ymd.has_value() ) { stream << std::format("{:%F}", tm); }
 
         if ( f.hms.has_value() ) {
             if ( f.ymd.has_value() ) { stream << (char)f.separator.value(); }
 
             if ( f.hms.value().millis && timestamp % 1000 ) {
-                stream << date::format("%T", tm);
+                stream << std::format("{:%T}", tm);
             } else {
                 const auto secs = duration_cast<seconds>(millis);
-                stream << date::format("%T", date::local_seconds(secs));
+                stream << std::format("{:%T}", local_seconds(secs));
             }
 
             if ( f.tz.has_value() ) {
-                if ( offset_seconds.count() == 0 ) {
+                if ( tzoffset.count() == 0 ) {
                     stream << 'Z';
                 } else {
-                    if ( f.tz.value() == Timezone::Colon ) to_stream(stream, "%Ez", tm, nullptr, &offset_seconds);
-                    else
-                        to_stream(stream, "%z", tm, nullptr, &offset_seconds);
+                    char     sign = tzoffset.count() < 0 ? '-' : '+';
+                    hh_mm_ss hms{sign == '-' ? -tzoffset : tzoffset};
+                    stream << std::format("{}{:02}", sign, hms.hours().count());
+                    if ( f.tz.value() == Timezone::Colon ) stream << ":";
+                    stream << std::format("{:02}", hms.minutes().count());
                 }
             }
         }

LiteCore/Query/SQLiteDateTimeHelpers.hh

@@ -1,33 +1,34 @@
 #pragma once
 
 #include "ParseDate.hh"
-#include "date/date.h"
 #include <chrono>
 #include <cmath>
 #include <ratio>
 #include <cstdint>
 #include "SQLiteFleeceUtil.hh"
 #include "DateFormat.hh"
 
-namespace date {
+using namespace std::chrono;
 
-    using namespace std::chrono;
+using quarters    = duration<int, std::ratio_multiply<std::ratio<3>, months::period>>;
+using decades     = duration<int, std::ratio_multiply<std::ratio<10>, years::period>>;
+using centuries   = duration<int, std::ratio_multiply<std::ratio<100>, years::period>>;
+using millenniums = duration<int, std::ratio_multiply<std::ratio<1000>, years::period>>;
 
-    using quarters    = duration<int, detail::ratio_multiply<std::ratio<3>, months::period>>;
-    using decades     = duration<int, detail::ratio_multiply<std::ratio<10>, years::period>>;
-    using centuries   = duration<int, detail::ratio_multiply<std::ratio<100>, years::period>>;
-    using millenniums = duration<int, detail::ratio_multiply<std::ratio<1000>, years::period>>;
+typedef struct {
+    int64_t year;
+    int64_t doy;
+    int64_t hour;
+    int64_t minute;
+    int64_t second;
+    int64_t millisecond;
+} DateDiff;
 
-    typedef struct {
-        int64_t year;
-        int64_t doy;
-        int64_t hour;
-        int64_t minute;
-        int64_t second;
-        int64_t millisecond;
-    } DateDiff;
+constexpr year_month_day& operator+=(year_month_day& ymd, decades d) noexcept { return ymd += years(d); }
 
-}  // namespace date
+constexpr year_month_day& operator+=(year_month_day& ymd, centuries c) noexcept { return ymd += years(c); }
+
+constexpr year_month_day& operator+=(year_month_day& ymd, millenniums m) noexcept { return ymd += years(m); }
 
 namespace litecore {
     using namespace fleece;
@@ -64,10 +65,10 @@ namespace litecore {
 
     // The Day Of Year for the given time_point. This is the number of days since the start of the year.
     inline int64_t doy(const date_time_point& t) {
-        const auto daypoint = floor<date::days>(t);
-        const auto ymd      = date::year_month_day{daypoint};
+        const auto daypoint = floor<days>(t);
+        const auto ymd      = year_month_day{daypoint};
         const auto year     = ymd.year();
-        const auto year_day = daypoint - date::sys_days{year / date::January / 0};
+        const auto year_day = daypoint - sys_days{year / std::chrono::January / 0};
         return year_day.count();
     }
 
@@ -110,8 +111,7 @@ namespace litecore {
         setResultTextFromSlice(ctx, DateFormat::format(buf, millis, asUTC, format));
     }
 
-    inline int64_t diffPart(const DateTime& t1, const DateTime& t2, const date::DateDiff& diff,
-                            const DateComponent part) {
+    inline int64_t diffPart(const DateTime& t1, const DateTime& t2, const DateDiff& diff, const DateComponent part) {
         switch ( part ) {
             case kDateComponentMillisecond:
                 {
@@ -184,12 +184,12 @@ namespace litecore {
             sign = -1;
         }
 
-        const date::DateDiff diff{left.Y - right.Y,
-                                  doy(tp_left) - doy(tp_right),
-                                  left.h - right.h,
-                                  left.m - right.m,
-                                  static_cast<int64_t>(left.s) - static_cast<int64_t>(right.s),
-                                  static_cast<int64_t>((frac(left.s) - frac(right.s)) * 1000)};
+        const DateDiff diff{left.Y - right.Y,
+                            doy(tp_left) - doy(tp_right),
+                            left.h - right.h,
+                            left.m - right.m,
+                            static_cast<int64_t>(left.s) - static_cast<int64_t>(right.s),
+                            static_cast<int64_t>((frac(left.s) - frac(right.s)) * 1000)};
 
         auto result = diffPart(left, right, diff, date_component);
         result *= sign;
@@ -201,7 +201,7 @@ namespace litecore {
         DateComponent date_component;
         if ( !part || (date_component = ParseDateComponent(part)) == kDateComponentInvalid ) { return -1; }
 
-        date::year_month_day      ymd = date::year(start.Y) / start.M / start.D;
+        year_month_day            ymd = year(start.Y) / start.M / start.D;
         std::chrono::milliseconds tod = std::chrono::hours(start.h) + std::chrono::minutes(start.m - start.tz)
                                         + std::chrono::milliseconds(static_cast<int64_t>(start.s * 1000));
 
@@ -219,34 +219,34 @@ namespace litecore {
                 tod += std::chrono::hours(amount);
                 break;
             case kDateComponentDay:
-                tod += date::days(amount);
+                tod += days(amount);
                 break;
             case kDateComponentWeek:
-                tod += date::weeks(amount);
+                tod += weeks(amount);
                 break;
             case kDateComponentMonth:
-                ymd += date::months(amount);
+                ymd += months(amount);
                 break;
             case kDateComponentQuarter:
-                ymd += date::quarters(amount);
+                ymd += quarters(amount);
                 break;
             case kDateComponentYear:
-                ymd += date::years(amount);
+                ymd += years(amount);
                 break;
             case kDateComponentDecade:
-                ymd += date::decades(amount);
+                ymd += decades(amount);
                 break;
             case kDateComponentCentury:
-                ymd += date::centuries(amount);
+                ymd += centuries(amount);
                 break;
             case kDateComponentMillennium:
-                ymd += date::millenniums(amount);
+                ymd += millenniums(amount);
                 break;
             case kDateComponentInvalid:
                 return -1;
         }
 
-        return (date::sys_days(ymd) + tod).time_since_epoch().count();
+        return (sys_days(ymd) + tod).time_since_epoch().count();
     }
 
 }  // namespace litecore

LiteCore/tests/QueryTest.cc

@@ -21,7 +21,6 @@
 #include <chrono>
 #include <limits>
 #include <numeric>
-#include "date/date.h"
 #include "ParseDate.hh"
 #include "SecureDigest.hh"
 #include <functional>
@@ -1818,40 +1817,42 @@ N_WAY_TEST_CASE_METHOD(QueryTest, "Query Distance Metrics", "[Query]") {
 
 
 N_WAY_TEST_CASE_METHOD(QueryTest, "Query Date Functions", "[Query][CBL-59]") {
-    constexpr date::local_seconds localtime      = date::local_days{date::year(2018) / 10 / 23};
-    tm                            tmpTime        = FromTimestamp(localtime.time_since_epoch());
-    const seconds                 offset_seconds = GetLocalTZOffset(&tmpTime, false);
-    date::local_seconds           utc_time       = localtime - offset_seconds;
+    constexpr local_seconds localtime      = local_days{year(2018) / 10 / 23};
+    tm                      tmpTime        = FromTimestamp(localtime.time_since_epoch());
+    const seconds           offset_seconds = GetLocalTZOffset(&tmpTime, false);
+    local_seconds           utc_time       = localtime - offset_seconds;
 
     // MILLIS_TO_STR() result should be in localtime.
-    stringstream                  mil_to_str;
-    constexpr date::local_seconds mil_to_str_time = localtime + 18h + 33min + 1s;
-    mil_to_str << date::format("%FT%T", mil_to_str_time + offset_seconds);
+    stringstream            mil_to_str;
+    constexpr local_seconds mil_to_str_time = localtime + 18h + 33min + 1s;
+    mil_to_str << std::format("{:%FT%T}", mil_to_str_time + offset_seconds);
     if ( offset_seconds.count() == 0 ) {
         mil_to_str << "Z";
     } else {
-        to_stream(mil_to_str, "%z", mil_to_str_time, nullptr, &offset_seconds);
+        char     sign = offset_seconds.count() < 0 ? '-' : '+';
+        hh_mm_ss hms{sign == '-' ? -offset_seconds : offset_seconds};
+        mil_to_str << std::format("{}{:02}{:02}", sign, hms.hours().count(), hms.minutes().count());
     }
     const auto mil_to_str_expected = mil_to_str.str();
 
     // These are all for STR_TO_UTC
     stringstream s1, s2, s3, s5;
     stringstream s1iso, s2iso, s3iso;
-    s1 << date::format("%F", utc_time);
-    s1iso << date::format("%FT%TZ", utc_time);
+    s1 << std::format("{:%F}", utc_time);
+    s1iso << std::format("{:%FT%TZ}", utc_time);
     utc_time += 18h + 33min;
-    s2 << date::format("%FT%TZ", utc_time);
-    s2iso << date::format("%FT%TZ", utc_time);
+    s2 << std::format("{:%FT%TZ}", utc_time);
+    s2iso << std::format("{:%FT%TZ}", utc_time);
     utc_time += 1s;
-    s3 << date::format("%FT%T", utc_time);
-    s3iso << date::format("%FT%TZ", utc_time);
-    s5 << date::format("%FT%TZ", utc_time);
+    s3 << std::format("{:%FT%T}", utc_time);
+    s3iso << std::format("{:%FT%TZ}", utc_time);
+    s5 << std::format("{:%FT%TZ}", utc_time);
 
-    constexpr date::local_seconds localtime2 = date::local_days{date::year(1944) / 6 / 6} + 6h + 30min;
-    tmpTime                                  = FromTimestamp(localtime2.time_since_epoch());
-    utc_time                                 = localtime2 - GetLocalTZOffset(&tmpTime, false);
+    constexpr local_seconds localtime2 = local_days{year(1944) / 6 / 6} + 6h + 30min;
+    tmpTime                            = FromTimestamp(localtime2.time_since_epoch());
+    utc_time                           = localtime2 - GetLocalTZOffset(&tmpTime, false);
     stringstream s4;
-    s4 << date::format("%FT%TZ", utc_time);
+    s4 << std::format("{:%FT%TZ}", utc_time);
 
     auto expected1    = s1.str();
     auto expected2    = s2.str();

Xcode/xcconfigs/Project.xcconfig

@@ -25,7 +25,7 @@ LITECORE_VERSION_STRING                            = 0.0.0
 LITECORE_BUILD_NUMBER                              = 0
 
 IPHONEOS_DEPLOYMENT_TARGET                         = 15.0
-MACOSX_DEPLOYMENT_TARGET                           = 13.0
+MACOSX_DEPLOYMENT_TARGET                           = 13.3
 TVOS_DEPLOYMENT_TARGET                             = 12.0
 ONLY_ACTIVE_ARCH                                   = YES
 SKIP_INSTALL                                       = YES