text: // Licensed to the Apache Software Foundation (ASF) under one
  // or more contributor license agreements.  See the NOTICE file
  // distributed with this work for additional information
  // regarding copyright ownership.  The ASF licenses this file
  // to you under the Apache License, Version 2.0 (the
  // "License"); you may not use this file except in compliance
  // with the License.  You may obtain a copy of the License at
  //
  //   http://www.apache.org/licenses/LICENSE-2.0
  //
  // Unless required by applicable law or agreed to in writing,
  // software distributed under the License is distributed on an
  // "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
  // KIND, either express or implied.  See the License for the
  // specific language governing permissions and limitations
  // under the License.
  
  #include "util/date_func.h"
  
  #include <iomanip>
  
  namespace doris {
  
  uint64_t timestamp_from_datetime(const std::string& datetime_str) {
      tm time_tm;
      char* res = strptime(datetime_str.c_str(), "%Y-%m-%d %H:%M:%S", &time_tm);
  
      uint64_t value = 0;
      if (nullptr != res) {
          value = ((time_tm.tm_year + 1900) * 10000L + (time_tm.tm_mon + 1) * 100L +
                   time_tm.tm_mday) *
                          1000000L +
                  time_tm.tm_hour * 10000L + time_tm.tm_min * 100L + time_tm.tm_sec;
      } else {
          // 1400 - 01 - 01
          value = 14000101000000;
      }
  
      return value;
  }
  
  uint24_t timestamp_from_date(const std::string& date_str) {
      tm time_tm;
      char* res = strptime(date_str.c_str(), "%Y-%m-%d", &time_tm);
  
      int value = 0;
      if (nullptr != res) {
          value = (time_tm.tm_year + 1900) * 16 * 32 + (time_tm.tm_mon + 1) * 32 + time_tm.tm_mday;
      } else {
          // 1400 - 01 - 01
          value = 716833;
      }
  
      return uint24_t(value);
  }
  // refer to https://dev.mysql.com/doc/refman/5.7/en/time.html
  // the time value between '-838:59:59' and '838:59:59'
  int32_t time_to_buffer_from_double(double time, char* buffer) {
      char* begin = buffer;
      if (time < 0) {
          time = -time;
          *buffer++ = '-';
      }
      if (time > 3020399) {
          time = 3020399;
      }
      int64_t hour = (int64_t)(time / 3600);
      if (hour >= 100) {
          auto f = fmt::format_int(hour);
          memcpy(buffer, f.data(), f.size());
          buffer = buffer + f.size();
      } else {
          *buffer++ = (char)('0' + (hour / 10));
          *buffer++ = (char)('0' + (hour % 10));
      }
      *buffer++ = ':';
      int32_t minute = ((int32_t)(time / 60)) % 60;
      *buffer++ = (char)('0' + (minute / 10));
      *buffer++ = (char)('0' + (minute % 10));
      *buffer++ = ':';
      int32_t second = ((int32_t)time) % 60;
      *buffer++ = (char)('0' + (second / 10));
      *buffer++ = (char)('0' + (second % 10));
      return buffer - begin;
  }
  
  } // namespace doris
  