ts_t	time_shield::cet_to_gmt (ts_t cet)
	Convert Central European Time to Greenwich Mean Time.

ts_t	time_shield::eet_to_gmt (ts_t eet)
	Convert Eastern European Time to Greenwich Mean Time.

bool	time_shield::is_us_eastern_dst_local (const DateTimeStruct &dt)
	Check if local US Eastern time uses DST.

ts_t	time_shield::et_to_gmt (ts_t et)
	Convert US Eastern Time (New York, EST/EDT) to GMT (UTC).

ts_t	time_shield::gmt_to_et (ts_t gmt)
	Convert GMT (UTC) to US Eastern Time (New York, EST/EDT).

ts_t	time_shield::ny_to_gmt (ts_t ny)
	Convert New York Time to GMT (UTC).

ts_t	time_shield::gmt_to_ny (ts_t gmt)
	Convert GMT (UTC) to New York Time.

ts_t	time_shield::ct_to_gmt (ts_t ct)
	Convert US Central Time (America/Chicago, CST/CDT) to GMT (UTC).

ts_t	time_shield::gmt_to_ct (ts_t gmt)
	Convert GMT (UTC) to US Central Time (America/Chicago, CST/CDT).

ts_t	time_shield::gmt_to_cet (ts_t gmt)
	Convert Greenwich Mean Time to Central European Time.

ts_t	time_shield::gmt_to_eet (ts_t gmt)
	Convert Greenwich Mean Time to Eastern European Time.

TIME_SHIELD_CONSTEXPR ts_t	time_shield::to_utc (ts_t local, tz_t utc_offset) noexcept
	Convert local timestamp (seconds) to UTC using UTC offset.

TIME_SHIELD_CONSTEXPR ts_t	time_shield::to_local (ts_t utc, tz_t utc_offset) noexcept
	Convert UTC timestamp (seconds) to local time using UTC offset.

TIME_SHIELD_CONSTEXPR ts_ms_t	time_shield::to_utc_ms (ts_ms_t local_ms, tz_t utc_offset) noexcept
	Convert local timestamp (milliseconds) to UTC using UTC offset.

TIME_SHIELD_CONSTEXPR ts_ms_t	time_shield::to_local_ms (ts_ms_t utc_ms, tz_t utc_offset) noexcept
	Convert UTC timestamp (milliseconds) to local time using UTC offset.

TIME_SHIELD_CONSTEXPR tz_t	time_shield::utc_offset_of (const TimeZoneStruct &tz) noexcept
	Extract numeric UTC offset (in seconds) from TimeZoneStruct.

Detailed Description

Function Documentation

◆ cet_to_gmt()

ts_t time_shield::cet_to_gmt ( ts_t cet )

inline

Convert Central European Time to Greenwich Mean Time.

Parameters

cet	Timestamp in seconds in CET.

Returns: Timestamp in seconds in GMT.

Definition at line 21 of file time_zone_conversions.hpp.

◆ ct_to_gmt()

ts_t time_shield::ct_to_gmt ( ts_t ct )

inline

Convert US Central Time (America/Chicago, CST/CDT) to GMT (UTC).

Parameters

ct	Timestamp in seconds in CT.

Returns: Timestamp in seconds in GMT (UTC).

Definition at line 190 of file time_zone_conversions.hpp.

◆ eet_to_gmt()

ts_t time_shield::eet_to_gmt ( ts_t eet )

inline

Convert Eastern European Time to Greenwich Mean Time.

Parameters

eet	Timestamp in seconds in EET.

Returns: Timestamp in seconds in GMT.

Definition at line 94 of file time_zone_conversions.hpp.

◆ et_to_gmt()

ts_t time_shield::et_to_gmt ( ts_t et )

inline

Convert US Eastern Time (New York, EST/EDT) to GMT (UTC).

Parameters

et	Timestamp in seconds in ET.

Returns: Timestamp in seconds in GMT (UTC).

GMT in this library uses UTC. DST rules are guaranteed for 1987+; earlier years use 1987-2006 rules as a best-effort approximation.

Definition at line 154 of file time_zone_conversions.hpp.

◆ gmt_to_cet()

ts_t time_shield::gmt_to_cet ( ts_t gmt )

inline

Convert Greenwich Mean Time to Central European Time.

Parameters

gmt	Timestamp in seconds in GMT.

Returns: Timestamp in seconds in CET.

Definition at line 204 of file time_zone_conversions.hpp.

◆ gmt_to_ct()

ts_t time_shield::gmt_to_ct ( ts_t gmt )

inline

Convert GMT (UTC) to US Central Time (America/Chicago, CST/CDT).

Parameters

gmt	Timestamp in seconds in GMT (UTC).

Returns: Timestamp in seconds in CT.

Definition at line 197 of file time_zone_conversions.hpp.

◆ gmt_to_eet()

ts_t time_shield::gmt_to_eet ( ts_t gmt )

inline

Convert Greenwich Mean Time to Eastern European Time.

Parameters

gmt	Timestamp in seconds in GMT.

Returns: Timestamp in seconds in EET.

Definition at line 239 of file time_zone_conversions.hpp.

◆ gmt_to_et()

ts_t time_shield::gmt_to_et ( ts_t gmt )

inline

Convert GMT (UTC) to US Eastern Time (New York, EST/EDT).

Parameters

gmt	Timestamp in seconds in GMT (UTC).

Returns: Timestamp in seconds in ET.

GMT in this library uses UTC. DST rules are guaranteed for 1987+; earlier years use 1987-2006 rules as a best-effort approximation.

Definition at line 166 of file time_zone_conversions.hpp.

◆ gmt_to_ny()

ts_t time_shield::gmt_to_ny ( ts_t gmt )

inline

Convert GMT (UTC) to New York Time.

Parameters

gmt	Timestamp in seconds in GMT (UTC).

Returns: Timestamp in seconds in ET.

Definition at line 183 of file time_zone_conversions.hpp.

◆ is_us_eastern_dst_local()

bool time_shield::is_us_eastern_dst_local ( const DateTimeStruct & dt )

inline

Check if local US Eastern time uses DST.

Parameters

dt	Local time in ET.

Returns: True if DST applies for the provided local timestamp.

Definition at line 101 of file time_zone_conversions.hpp.

◆ ny_to_gmt()

ts_t time_shield::ny_to_gmt ( ts_t ny )

inline

Convert New York Time to GMT (UTC).

Parameters

ny	Timestamp in seconds in ET.

Returns: Timestamp in seconds in GMT (UTC).

Definition at line 176 of file time_zone_conversions.hpp.

◆ to_local()

TIME_SHIELD_CONSTEXPR ts_t time_shield::to_local	(	ts_t	utc,
		tz_t	utc_offset )

inlinenoexcept

Convert UTC timestamp (seconds) to local time using UTC offset.

Parameters

utc	UTC timestamp in seconds.
utc_offset	UTC offset in seconds (e.g. CET=+3600, MSK=+10800, EST=-18000).

Returns: Local timestamp in seconds. If utc equals ERROR_TIMESTAMP, returns ERROR_TIMESTAMP.

Definition at line 43 of file time_zone_offset.hpp.

◆ to_local_ms()

TIME_SHIELD_CONSTEXPR ts_ms_t time_shield::to_local_ms	(	ts_ms_t	utc_ms,
		tz_t	utc_offset )

inlinenoexcept

Convert UTC timestamp (milliseconds) to local time using UTC offset.

Parameters

utc_ms	UTC timestamp in milliseconds.
utc_offset	UTC offset in seconds (will be converted to milliseconds).

Returns: Local timestamp in milliseconds. If utc_ms equals ERROR_TIMESTAMP, returns ERROR_TIMESTAMP.

Definition at line 61 of file time_zone_offset.hpp.

◆ to_utc()

TIME_SHIELD_CONSTEXPR ts_t time_shield::to_utc	(	ts_t	local,
		tz_t	utc_offset )

inlinenoexcept

Convert local timestamp (seconds) to UTC using UTC offset.

Parameters

local	Local timestamp in seconds.
utc_offset	UTC offset in seconds (e.g. CET=+3600, MSK=+10800, EST=-18000).

Returns: UTC timestamp in seconds. If local equals ERROR_TIMESTAMP, returns ERROR_TIMESTAMP.

Definition at line 34 of file time_zone_offset.hpp.

◆ to_utc_ms()

TIME_SHIELD_CONSTEXPR ts_ms_t time_shield::to_utc_ms	(	ts_ms_t	local_ms,
		tz_t	utc_offset )

inlinenoexcept

Convert local timestamp (milliseconds) to UTC using UTC offset.

Parameters

local_ms	Local timestamp in milliseconds.
utc_offset	UTC offset in seconds (will be converted to milliseconds).

Returns: UTC timestamp in milliseconds. If local_ms equals ERROR_TIMESTAMP, returns ERROR_TIMESTAMP.

Definition at line 52 of file time_zone_offset.hpp.

◆ utc_offset_of()

TIME_SHIELD_CONSTEXPR tz_t time_shield::utc_offset_of ( const TimeZoneStruct & tz )

inlinenoexcept

Extract numeric UTC offset (in seconds) from TimeZoneStruct.

Parameters

tz	Time zone descriptor.

Returns: UTC offset in seconds (local = utc + offset).

Definition at line 69 of file time_zone_offset.hpp.