D-day Calculator
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Korean Military Discharge & Promotion Calculator
Estimate South Korean military discharge, service progress, rank milestones and D-100. Override actual promotion dates and save individual or all milestones to your calendar.
Processed on your device · No file uploads
Your selected files and results are processed on this device. They are not sent to external servers or stored on our servers.
How processing works- 01Select input
- 02Process locally
- 03Review & save
Loading the tool. JavaScript is required.
Example input & result
Input & settings
Army enlistment 2026-01-01 · promotions assumed at +2/+8/+14 months
Expected result
PFC +3 months: 2026-06-01 · corporal +3 months: 2026-12-01 · sergeant midpoint: 2027-05-01 · D-100: 2027-03-22
Illustrative dates based on assumptions, not predicted appointments, reviews or early/delayed promotions. Prefer actual unit-issued dates.
How to use Korean Military Discharge & Promotion Calculator
- 01Choose enlistment, branch and reference dates; enter an official discharge date if known.
- 02Open promotion assumptions to enter actual PFC, corporal and sergeant dates and a custom N-day target.
- 03Calculate, review the next milestone and download individual events or the complete calendar.
Frequently asked questions
Are discharge and promotion dates official?
No. General active-duty service periods estimate discharge; blank promotion dates assume enlistment +2/+8/+14 months. Official unit and MMA dates take priority.
How are Il-kkeok and Sang-kkeok calculated?
This tool adds 3 calendar months to the PFC or corporal date, displaying it only before the next promotion. It does not determine official rank or pay-grade service.
What are sergeant and service midpoints?
The tool halves the calendar-date difference from sergeant promotion or enlistment to discharge and rounds up. Slang usage may differ, and branch/individual service lengths vary.
Is service day 100 the same as discharge D-100?
No. Inclusive service day 100 adds 99 days to enlistment; discharge D-100 subtracts 100 days from discharge. D-300/200/100/50/30/7/1 and custom N-day milestones are shown within service dates.
Can I enter actual promotion dates?
Yes. Enter PFC, corporal and sergeant dates in chronological rank order within the service period. Changing inputs clears prior results; calculate again.
Are service dates stored on a server?
No inputs or results are stored or uploaded. Downloaded ICS files contain the chosen milestones; synchronization then follows your calendar app settings.
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