| // Copyright 2020 The Pigweed Authors |
| // |
| // Licensed 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 |
| // |
| // https://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. |
| #pragma once |
| |
| namespace pw::chrono { |
| |
| enum class Epoch { |
| // The epoch is unkown and possibly even undefined in case the clock is not |
| // always enabled and the epoch may reset over time. |
| kUnknown, |
| |
| kTimeSinceBoot, |
| |
| // Time since 00:00:00 UTC, Thursday, 1 January 1970, including leap seconds. |
| kUtcWallClock, |
| |
| // Time since 00:00:00, 6 January 1980 UTC. Leap seconds are not inserted into |
| // GPS. Thus, every time a leap second is inserted into UTC, UTC falls another |
| // second behind GPS. |
| kGpsWallClock, |
| |
| // Time since 00:00:00, 1 January 1958, and is offset 10 seconds ahead of UTC |
| // at that date (i.e., its epoch, 1958-01-01 00:00:00 TAI, is 1957-12-31 |
| // 23:59:50 UTC). Leap seconds are not inserted into TAI. Thus, every time a |
| // leap second is inserted into UTC, UTC falls another second behind TAI. |
| kTaiWallClock, |
| }; |
| |
| } // namespace pw::chrono |
