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DateTimeMate
jftuga · 2026-07-09 · via Hacker News
Start date/time End date/time

Brief output

Absolute value (always positive)

From date/time Duration Operation Output format (optional)
strftime specifiers reference
%Afull weekday name
%aabbreviated weekday name
%Bfull month name
%babbreviated month name
%C(year / 100) as decimal
%cnational representation of time and date
%Dequivalent to %m/%d/%y
%dday of month (01-31)
%eday of month (1-31, blank-padded)
%Fequivalent to %Y-%m-%d
%Hhour, 24-hour (00-23)
%hsame as %b
%Ihour, 12-hour (01-12)
%jday of year (001-366)
%khour, 24-hour (0-23, blank-padded)
%lhour, 12-hour (1-12, blank-padded)
%Mminute (00-59)
%mmonth (01-12)
%nnewline
%pAM or PM
%Requivalent to %H:%M
%requivalent to %I:%M:%S %p
%Ssecond (00-60)
%sseconds since Unix epoch
%Tequivalent to %H:%M:%S
%ttab
%Uweek of year, Sunday first (00-53)
%uweekday, Monday=1 (1-7)
%Vweek of year, Monday first (01-53)
%vequivalent to %e-%b-%Y
%Wweek of year, Monday first (00-53)
%wweekday, Sunday=0 (0-6)
%Xnational representation of time
%xnational representation of date
%Yyear with century
%yyear without century (00-99)
%Ztime zone name
%ztime zone offset from UTC
%%literal %

Repeat (0-100)

Until (optional)

Repeat and until are mutually exclusive. Until is capped at 2 years from now.

Duration notation: dates uppercase (Y M W D), times lowercase (h m s ms us ns)

First duration Second duration Operation

Convert result to units (optional)

Decimals (0-9)

Decimals requires convert units. Negative durations are not allowed as inputs; use Subtract.

Brief output

Absolute value (always positive)

Duration notation: dates uppercase (Y M W D), times lowercase (h m s ms us ns)

Source duration Target units

Decimals shows the smallest unit with N decimal places, rounded.

Brief output

Brief notation: dates uppercase (Y W D), times lowercase (h m s), sub-seconds after dot (ms us ns)

Date/time Output format (strftime)
strftime specifiers reference
%Afull weekday name
%aabbreviated weekday name
%Bfull month name
%babbreviated month name
%C(year / 100) as decimal
%cnational representation of time and date
%Dequivalent to %m/%d/%y
%dday of month (01-31)
%eday of month (1-31, blank-padded)
%Fequivalent to %Y-%m-%d
%Hhour, 24-hour (00-23)
%hsame as %b
%Ihour, 12-hour (01-12)
%jday of year (001-366)
%khour, 24-hour (0-23, blank-padded)
%lhour, 12-hour (1-12, blank-padded)
%Mminute (00-59)
%mmonth (01-12)
%nnewline
%pAM or PM
%Requivalent to %H:%M
%requivalent to %I:%M:%S %p
%Ssecond (00-60)
%sseconds since Unix epoch
%Tequivalent to %H:%M:%S
%ttab
%Uweek of year, Sunday first (00-53)
%uweekday, Monday=1 (1-7)
%Vweek of year, Monday first (01-53)
%vequivalent to %e-%b-%Y
%Wweek of year, Monday first (00-53)
%wweekday, Sunday=0 (0-6)
%Xnational representation of time
%xnational representation of date
%Yyear with century
%yyear without century (00-99)
%Ztime zone name
%ztime zone offset from UTC
%%literal %
Source date/time

Include a time zone; a zone-less time is interpreted as server-local time.

Target time zone Australian Central Daylight Time (UTC+10:30) Australian Central Standard Time (UTC+09:30) Australian Central Western Standard Time (UTC+08:45) Atlantic Daylight Time (UTC-03:00) Australian Eastern Daylight Time (UTC+11:00) Australian Eastern Standard Time (UTC+10:00) Afghanistan Time (UTC+04:30) Alaska Daylight Time (UTC-08:00) Alaska Standard Time (UTC-09:00) Argentina Time (UTC-03:00) Atlantic Standard Time (UTC-04:00) Australian Western Standard Time (UTC+08:00) Brasilia Summer Time (UTC-02:00) Brasilia Time (UTC-03:00) British Summer Time (UTC+01:00) Central Australia Standard Time (synonym for ACST) (UTC+09:30) Central Daylight Time (North America) (UTC-05:00) Central European Summer Time (UTC+02:00) Central European Time (UTC+01:00) Chatham Standard Time (UTC+12:45) China Standard Time (UTC+08:00) Central Standard Time (North America) (UTC-06:00) East Africa Time (UTC+03:00) Eastern Daylight Time (UTC-04:00) Eastern European Summer Time (UTC+03:00) Eastern European Time (UTC+02:00) Eastern Standard Time (North America) (UTC-05:00) Greenwich Mean Time (UTC+00:00) Gulf Standard Time (UTC+04:00) Hawaii-Aleutian Daylight Time (UTC-09:00) Hawaii-Aleutian Standard Time (same as HST) (UTC-10:00) Newfoundland Daylight Time (same as NDT) (UTC-02:30) Hong Kong Time (UTC+08:00) Hawaii Standard Time (UTC-10:00) Iran Standard Time (UTC+03:30) India Standard Time (UTC+05:30) Japan Standard Time (UTC+09:00) Korea Standard Time (UTC+09:00) Lord Howe Daylight Time (unusual 30-minute DST advance) (UTC+11:00) Mountain Daylight Time (UTC-06:00) Mountain Standard Time (UTC-07:00) Newfoundland Daylight Time (UTC-02:30) Nepal Time (UTC+05:45) Newfoundland Standard Time (UTC-03:30) New Zealand Daylight Time (UTC+13:00) New Zealand Standard Time (UTC+12:00) Pacific Daylight Time (UTC-07:00) Philippine Time (UTC+08:00) Pakistan Standard Time (UTC+05:00) Pacific Standard Time (UTC-08:00) Singapore Time (UTC+08:00) Samoa Standard Time (UTC-11:00) Universal Time (UTC+00:00) Coordinated Universal Time (UTC+00:00) Western European Summer Time (UTC+01:00) Western European Time (UTC+00:00)

Accepts an IANA zone name, an abbreviation, or a UTC offset in seconds (e.g., 19800 = UTC+05:30).

Allow dates before 1970

time zone abbreviations reference
ACDTUTC+10:30Australian Central Daylight Time
ACSTUTC+09:30Australian Central Standard Time
ACWSTUTC+08:45Australian Central Western Standard Time
ADTUTC-03:00Atlantic Daylight Time
AEDTUTC+11:00Australian Eastern Daylight Time
AESTUTC+10:00Australian Eastern Standard Time
AFTUTC+04:30Afghanistan Time
AKDTUTC-08:00Alaska Daylight Time
AKSTUTC-09:00Alaska Standard Time
ARTUTC-03:00Argentina Time
ASTUTC-04:00Atlantic Standard Time [ambiguous; also: Arabia Standard Time (UTC+3)]
AWSTUTC+08:00Australian Western Standard Time
BRSTUTC-02:00Brasilia Summer Time
BRTUTC-03:00Brasilia Time
BSTUTC+01:00British Summer Time [ambiguous; also: Bangladesh Standard Time (UTC+6)]
CASTUTC+09:30Central Australia Standard Time (synonym for ACST)
CDTUTC-05:00Central Daylight Time (North America) [ambiguous; also: Cuba Daylight Time (UTC-4)]
CESTUTC+02:00Central European Summer Time
CETUTC+01:00Central European Time
CHASTUTC+12:45Chatham Standard Time
CNSTUTC+08:00China Standard Time
CSTUTC-06:00Central Standard Time (North America) [ambiguous; also: China Standard Time (UTC+8), Cuba Standard Time (UTC-5)]
EATUTC+03:00East Africa Time
EDTUTC-04:00Eastern Daylight Time
EESTUTC+03:00Eastern European Summer Time
EETUTC+02:00Eastern European Time
ESTUTC-05:00Eastern Standard Time (North America) [ambiguous; also: Australian Eastern Standard Time (UTC+10)]
GMTUTC+00:00Greenwich Mean Time
GSTUTC+04:00Gulf Standard Time [ambiguous; also: South Georgia Time (UTC-2)]
HADTUTC-09:00Hawaii-Aleutian Daylight Time
HASTUTC-10:00Hawaii-Aleutian Standard Time (same as HST)
HATUTC-02:30Newfoundland Daylight Time (same as NDT)
HKTUTC+08:00Hong Kong Time
HSTUTC-10:00Hawaii Standard Time
IRSTUTC+03:30Iran Standard Time
ISTUTC+05:30India Standard Time [ambiguous; also: Israel Standard Time (UTC+2), Irish Standard Time (UTC+1)]
JSTUTC+09:00Japan Standard Time
KSTUTC+09:00Korea Standard Time
LHDTUTC+11:00Lord Howe Daylight Time (unusual 30-minute DST advance)
MDTUTC-06:00Mountain Daylight Time
MSTUTC-07:00Mountain Standard Time
NDTUTC-02:30Newfoundland Daylight Time
NPTUTC+05:45Nepal Time
NSTUTC-03:30Newfoundland Standard Time
NZDTUTC+13:00New Zealand Daylight Time
NZSTUTC+12:00New Zealand Standard Time
PDTUTC-07:00Pacific Daylight Time
PHTUTC+08:00Philippine Time
PKTUTC+05:00Pakistan Standard Time
PSTUTC-08:00Pacific Standard Time [ambiguous; also: Philippine Standard Time (UTC+8)]
SGTUTC+08:00Singapore Time
SSTUTC-11:00Samoa Standard Time [ambiguous; also: Singapore Standard Time (UTC+8; use SGT)]
UTUTC+00:00Universal Time
UTCUTC+00:00Coordinated Universal Time
WESTUTC+01:00Western European Summer Time
WETUTC+00:00Western European Time